Lairs: Box Zero — What’s Inside?

What is Lairs: Box Zero?

Lairs: Box Zero (also printed or listed as Box 0) is a small expansion for Lairs, the two-player dungeon-building and exploration game from Kids Table Board Gaming (KTBG). It adds Monsters, Traps, their matching pieces and a sealed envelope of extra material. It is not a standalone game. You need the Lairs base box to use it.

The crucial buying detail is that the publisher’s current Base Game + Box 0 product already includes Box Zero. If you own or buy that specific bundle, you should not need to purchase a separate Box Zero copy. Older and second-hand Lairs boxes can be different, so always check the edition rather than assuming every copy has the mini expansion. KTBG’s official bundle listing confirms both the inclusion and that no other expansion is required to play.

Box Zero is a smaller taste of the surprises found in the larger Adventurer’s Pack, not a substitute for that pack or for Deeper Dungeons. The sealed-envelope concept lets players add material without knowing all its details in advance.

This article is deliberately spoiler-free. It covers the components and how the product fits into the range, but not the identity or secret text of the four cards in the envelope. For an introduction to how the base game’s dungeon building and exploration work, visit our Lairs board game guide.

Lairs: Box Zero contents — complete public inventory

KTBG publishes a concise list of exactly what the mini expansion adds. Use this as a component check before mixing pieces into your base-game supply, or when inspecting a second-hand copy.

Counting carefully: the public inventory establishes two Monster cards and two Trap cards outside the envelope, plus four more cards inside it. It does not publicly identify those four secret cards by type. Do not count them as four extra Monsters, four extra Traps, or a guaranteed particular mix without opening the envelope and checking its printed rules.

The inventory comes directly from KTBG’s official product page, which also lists the contents of the base game separately. A retailer listing or online photo might show unpacked components, but the publisher’s written inventory is the preferred reference for this guide.

Base game versus Box Zero: what is actually new?

Because retailers often advertise Lairs + Box Zero as one combined product, it is easy to confuse the main game’s contents with the mini expansion. The base box already has the screens, boards, pencils, dice and starter encounters needed for a complete game. Box Zero adds variety and unlockable material; it does not supply the fundamental game system.

Practical example: if you buy a used Lairs base box containing two Lair boards, two screens and the starting Hungry Blob and Greased Pit, you have found the essential base-game elements. But you have not proven it includes Box Zero. You also need the two extra Monster cards, two extra Trap cards, their pieces and the envelope listed above.

Conversely, if a seller offers only the tiny Box Zero package, do not expect it to contain a Lair board, screens, map pad or dice. Those belong to the base game and are necessary to play.

Which Lairs editions include Box Zero?

Look at the actual product title and contents, not just the Lairs logo. KTBG’s official combined product is called Lairs Base Game + Box 0. Asmodee UK lists Lairs Standard Game and Box Zero under SKU KTG15010. Other retailers write Box Zero, Box 0, or + Box 0 for the same mini expansion.

The official Asmodee UK entry lists a publisher release date of 16 September 2026 for its combined SKU. That is a product listing date, not a guarantee that every shop in every country received stock on that day. A retailer’s current availability, shipping date or local price can differ.

Some players own an earlier base-game package that did not originally include Box Zero. The BoardGameGeek Box Zero listing notes that distinction. If you are buying second-hand, compare the physical contents rather than relying on the year shown in a marketplace listing.

Checklist: buying Lairs or Box Zero second-hand

A complete-looking box can still be missing a tiny sealed envelope or matching Trap tile. Use this short process before paying for a used copy, especially if the listing says complete without an inventory photo.

1. Confirm what is being sold. Is the offer for the base game, Base Game + Box Zero, Box Zero alone or a larger Kickstarter bundle?
2. Verify the core game. Check for the two recessed boards, screens, player mats, dice, maps and other base components if you are starting from nothing.
3. Count the Box Zero Monster pieces. You should see two added Monster cards and four wooden Monster meeples attributable to this pack.
4. Count the Box Zero Trap pieces. The advertised pack provides two Trap cards and four Trap tiles.
5. Ask about the envelope. Is it still sealed, opened but complete, or missing? It should contain four additional cards plus a rules sheet. An opened envelope can still be usable, but buyers should know its status.
6. Check what was mixed together. In a played collection, the new Monster and Trap pieces may already be stored with base-game components; ask the seller to separate or identify them.
7. Do not pay twice. Compare the bundle’s listed contents against what you already own before buying a standalone Box Zero product.

Important distinction: a seal is not a gameplay requirement. A used Box Zero with all components and a previously opened envelope may be perfectly usable. A buyer looking for the intended surprise experience, however, should know whether the envelope has already been revealed.

Keep a photo or written list of the components before you combine them into the main box. That makes it easier to sell, replace or store the game later.

How Box Zero changes Lairs gameplay without changing the player count

In base Lairs, two players secretly build dungeons for one another using walls, traps, monsters and treasure. They then attempt to navigate the rival’s hidden labyrinth, keeping track of their route, solving obstacles and collecting treasure. The winner is determined by the game’s score, which rewards objectives such as treasure, overcome monsters and reaching the exit. Box Zero adds new elements inside this existing structure.

The meaningful change is encounter variety. Having additional Monster and Trap options means that a player planning a dungeon can potentially introduce threats the opponent may not have experienced in earlier games. That creates more uncertainty for the explorer and different decisions for the dungeon builder.

Box Zero does not advertise new Player screens, larger dungeon boards or a three-to-four-player mode. Those are the sort of larger changes described for other products in the range. The combined base game remains primarily a two-player competitive duel.

A practical effect on repeat play

Consider two successive games with the same opponents. In the first, both players have seen the base game’s Hungry Blob and Greased Pit. In the next, the dungeon creator has additional Box Zero Monster and Trap options. The explorer may still know the core movement and mapping procedures, but the encounter possibilities are less familiar. That is the relevant replayability benefit: new problems inside a known framework, rather than a wholly different game.

No invented rules: the exact powers, conditions and timing of each added Monster and Trap are determined by its printed card and the package-specific instructions. Public product listings verify the component types, not the full text of every secret effect. The article therefore does not supply unofficial monster stats or guessed trap resolutions.

What’s in the sealed Box Zero envelope?

The publisher’s public inventory specifies four cards and one rules sheet inside the envelope. It does not identify those cards in the list. That is intentional for a product built around discovering additional material over time.

Should you open it immediately? If you want to experience Lairs as designed, learn the base game first and follow the instructions accompanying Box Zero for when to introduce its content. Do not open the envelope simply to verify spoilers online. Some groups prefer to explore all additions right away, but they should still read the package directions rather than assume the secret cards are ordinary base-game cards.

Can someone check a used copy without spoiling it? Yes: ask the seller to confirm the envelope is present and, if opened, that it contains four cards plus a sheet. They need not send photos of card faces if you want to preserve the surprise.

Are the four cards extra Monster cards? The public list does not say that. It only says four more cards, so claiming a specific breakdown would be speculation. The two Monster cards and two Trap cards explicitly listed outside the envelope should not be confused with that additional packet.

This article deliberately avoids naming unpublished surprises or reproducing the sealed rules. Readers who prefer complete spoilers can consult their own purchased components and printed instructions.

When should you add Box Zero to your first Lairs games?

Box Zero is designed to be a manageable bridge between the base game and larger unlockable-content expansions. That does not mean there is a universal required number of introductory sessions before it becomes usable.

• First experience with Lairs: learn dungeon construction and exploration using the base components. Focus on understanding the hidden map, Monster/Trap encounters and scoring.
• Once both players understand the core flow: introduce Box Zero according to its printed instructions. The added encounters should feel more meaningful when the base Monsters and Traps are familiar.
• If one player is experienced and the other is new: discuss whether using the extra components will make a first game less transparent. An initial base-only game may be a fairer teaching setup.
• After multiple games: keep the Box Zero additions in the normal component pool as the rules allow, or explore the Adventurer’s Pack for a more extensive unlockable progression.

Teaching recommendation, not a publisher rule: separate the explanation of the base game from any new Box Zero effects. Players can learn the deduction and mapping puzzle first, then evaluate a new Trap or Monster card individually. This avoids treating a rules explanation and a product-unboxing surprise as the same task.

Lairs Box Zero vs Adventurer’s Pack vs Deeper Dungeons

These three products serve different purposes and have different requirements. Confusing them can lead to purchasing a box you cannot yet use.

Box Zero is the smallest step. The Adventurer’s Pack deepens the original two-player dungeon-crawling experience through a larger series of discoveries. Deeper Dungeons changes the scope much more substantially, including a three- or four-player mode.

KTBG explicitly says Deeper Dungeons requires both the base game and the Adventurer’s Pack. That is a different purchase dependency from Box Zero. Buying Deeper Dungeons as your first Lairs box is not sufficient. Official Deeper Dungeons product listing.

Simple recommendation: start with Base Game + Box Zero if you do not own Lairs. Move to the Adventurer’s Pack when you want substantially more unlockable content. Consider Deeper Dungeons afterward if the larger boards, more extensive systems or expanded player count appeal to your group.

Do you need Box Zero before Adventurer’s Pack?

No separate Box Zero purchase is a prerequisite for the Adventurer’s Pack. KTBG describes Box Zero as material that can be carried forward into the Adventurer’s Pack, not as something that must be completed before you can start using the larger expansion. The publisher’s combined base game now includes it, so many purchasers will already have Box Zero when they move on.

Adventurer’s Pack introduces its content progressively in boxes and envelopes, including new skill options and obstacles. It aims at players who already understand the base game’s rhythm and would like a larger ongoing discovery path.

If your group enjoys the reveal-and-learn feeling of Box Zero, the Adventurer’s Pack is the clearest next product. If you found the base deduction duel more enjoyable without unusual new effects, there is no obligation to buy more content just because an expansion exists.

For readers who already own a Kickstarter bundle, check whether the Adventurer’s Pack was already included. Kickstarter Edition product records include package configurations different from the standard retail offering. Avoid treating Kickstarter Edition as simply another name for Base Game + Box Zero.

Does Box Zero make Lairs playable with 3 or 4 players?

No. Box Zero adds encounters and surprise cards to the existing two-player game. The three- and four-player option is part of Lairs: Deeper Dungeons, which also adds bigger dungeon layouts, playable Characters, Boss Monsters, Terrain, Weird Walls and other modules.

More players are not the only reason to buy Deeper Dungeons: even a two-person group might want the larger maps and mechanical choices. But it is a much more substantial expansion than Box Zero, with further requirements.

KTBG’s product page specifically says you must own the base game and Adventurer’s Pack to use Deeper Dungeons. Therefore the combination Base Game + Box Zero + Deeper Dungeons is not the complete publisher-recommended setup if you lack Adventurer’s Pack.

For buyer research, the Asmodee UK Deeper Dungeons listing advertises two-to-four-player support for that expansion, while the standard base bundle is listed for two players. The distinction is the product level and required modules, not a simple optional rule you can enable from Box Zero alone.

Is Box Zero worth buying separately?

The first question is whether you already have it. If you own the official Base Game + Box 0 bundle, another Box Zero would normally duplicate content. If you own an older base box without it, the separately sold mini expansion is a focused way to obtain a few extra Monster and Trap options without committing to a larger expansion.

• You are buying Lairs for the first time: choose a clearly labeled Base Game + Box Zero bundle rather than assuming the separate mini expansion is a starter set.
• You own an older base box: compare your inventory with the publisher checklist. A separate Box Zero may be useful if it is genuinely absent.
• You bought a Kickstarter bundle: inventory what was included in that pledge. Do not rely on retail bundle names to identify everything you have.
• You enjoy small additions but do not want major new systems: Box Zero is more directly relevant than Deeper Dungeons.
• You want new long-term character or skill progression: consider the Adventurer’s Pack, with more packages and attribute cubes, instead of assuming Box Zero provides the same breadth.
• You want 3–4 players: Box Zero will not accomplish that; investigate Deeper Dungeons and all its required boxes.

Retailers such as Zatu Games list Box 0 separately, while Asmodee UK lists the combined base product. Those are examples of available product formats, not a claim about stock or the cheapest current price. Always check the specific listing at purchase time.

Six Box Zero mistakes to avoid

• Buying Box Zero as a standalone game: it does not include the dungeon boards, screens, map pad or dice needed to play.
• Paying twice for the same expansion: the 2026 publisher Base Game + Box 0 bundle already contains it.
• Guessing the sealed envelope contents: the publisher confirms four cards and a rules sheet but does not publicly specify their secret identities.
• Assuming every older base copy has it: verify the edition or physically check the mini-expansion components in a second-hand game.
• Expecting Box Zero to add more players: the expansion for three or four participants is Deeper Dungeons, with its separate requirements.
• Confusing Box Zero with Adventurer’s Pack: Box Zero is a small taste of the unlockable system; Adventurer’s Pack is a larger product with additional progression and packages.

The most effective buying habit is to compare a seller’s product name and photos with KTBG’s separate base-game and Box Zero component lists. A few minutes of verification can prevent the wrong expansion purchase or a missing-envelope surprise.

Lairs Box Zero FAQ

What is Lairs Box Zero?

A small expansion for the two-player dungeon-building game Lairs that adds Monsters, Traps and a secret envelope.

What comes in Lairs Box Zero?

Two Monster cards, four wooden Monster meeples, two Trap cards, four Trap tiles and an envelope containing four additional cards and a rules sheet.

How many cards are in Box Zero?

Its published component inventory specifies two Monster cards and two Trap cards, plus four more cards inside the envelope. That makes eight cards in total, with their types identified publicly only for the first four.

Does Box Zero include the Lairs base game?

No, not when sold as the separate mini expansion. However, some combined retail products explicitly bundle Base Lairs with Box Zero.

Is Box Zero already included in Lairs?

KTBG’s current Base Game + Box 0 bundle includes it. Earlier editions and used copies may not. Check the product title and contents.

Can you play Lairs without Box Zero?

Yes. The base game is complete and playable without the mini expansion.

Can you play Box Zero without the Lairs base game?

No. It contains add-on material but not the essential boards and other base components.

What is inside the sealed envelope?

The official public inventory specifies four cards and a rules sheet. This guide does not disclose their identities, preserving the intended surprise.

Should I open Box Zero before playing Lairs for the first time?

It is sensible to learn the base game first and follow the included package directions before introducing new content. That is teaching advice, not an invented universal opening rule.

Is Box Zero compatible with Adventurer’s Pack?

Yes. KTBG says Box Zero can be carried into the Adventurer’s Pack experience.

Do I need Adventurer’s Pack to use Box Zero?

No. Box Zero only requires the Lairs base game.

Do I need Box Zero to use Adventurer’s Pack?

The published product dependencies do not identify Box Zero as a mandatory separate purchase. The Adventurer’s Pack requires Lairs.

Does Box Zero expand Lairs to four players?

No. That feature belongs to Deeper Dungeons, which requires the base game and Adventurer’s Pack.

Does Deeper Dungeons include Box Zero?

Deeper Dungeons is a different expansion. Do not assume it contains the Box Zero mini expansion unless your seller advertises a specific bundle.

What is the difference between Box 0 and Box Zero?

They are alternative names for the same mini expansion. Retail packaging and listing titles may use either spelling.

What if my used copy has an opened envelope?

Ask the seller to verify the four extra cards and rules sheet are complete. The surprise may be gone, but the package can still be usable.

Where can I find an official component list?

KTBG’s Base Game + Box 0 page lists the base game and Box Zero contents separately.

Sources, verification and editorial methodology

Publisher inventory: Kids Table Board Gaming — Lairs Base Game + Box 0. This is the primary source for each Box Zero component count, included-bundle status, stand-alone limitations and compatibility with Adventurer’s Pack. KTBG’s Lairs overview also confirms that current base copies are bundled with Box Zero.

Retail edition identification: Asmodee UK — Lairs Standard Game and Box Zero (SKU KTG15010) identifies the UK combined product and its publisher release date. Zatu Games — Box 0 illustrates that the mini expansion can also be listed separately.

Expansion dependencies: KTBG — Lairs: Deeper Dungeons confirms the base game plus Adventurer’s Pack requirement and multiplayer mode. BoardGameGeek — Adventurer’s Pack describes the larger unlockable progression. BoardGameGeek — Box Zero notes that earlier base copies did not necessarily include the mini expansion.

Editorial scope: This is a self-contained buying and component guide based on public product inventories. It is not a hands-on review, a reproduction of copyrighted rules or an unboxing of the secret envelope. Recommendations about learning order and second-hand inspections are editorial advice. Product availability varies by retailer. Last checked 1 November 2026. See our editorial standards and Lairs hub.