House of 21

House of 21 is a roguelike deckbuilder where blackjack is your weapon.

You're trapped in a casino purgatory between life and death. Build your deck, push your luck and take on the House. 

How combat works:

• Draw cards one at a time, each one raises your total

• Stand at any time to lock in your hand

• Hit 21 and deal double damage

• Go over and bust. Your cards are halved and your hand shrinks

• After standing, drag each card onto an enemy to attack or onto yourself to block

• Every card in your hand is both a weapon and a shield. You decide how to spend it

• The closer you push to 21, the stronger your hand. But one card too many and the turn collapses.

Cards & Badges

• Every card in your deck is a standard playing card, but badges change what they do. 

• 130+ badges to discover

• Badges are permanent modifiers attached to individual cards

• Each card can carry up to 2 badges at once

• Badges trigger on specific moments: when you draw, stand, hit 21, bust, attack, or defend

• Stack two badges on the same card to create powerful combos

• Build around synergies. A card with Venom and Cleave weakens every enemy it hits

• Your deck starts simple. By the end of a run, every card should be doing something.

Relics

• Passive items collected across your run

• 80+ Relics to discover 

• Some reward clean play

• Some reward risk

• Others bend the rules 

Enemies

• Enemies telegraph their next move. Some have dynamic intents that adapt to your stand total or if you bust

• 40+ enemies to battle. Casino objects brought to life, cursed staff and more

• Traits are permanent passive rules unique to each enemy: Nimble halves damage from high cards, Bulwark absorbs the first hit each turn, Spiky punishes low cards

• Elites hit harder and carry rarer traits

• Bosses shift through phases, summon reinforcements, and force you to adapt mid fight

Additional Features

• 3 playable characters, each with a unique ability and deckbuilding identity

• A procedurally generated map with battles, elite fights, shops, events, and recovery bars

• A shop to buy badges, relics, and new cards, or discard what you don't need 

• Card upgrades between battles from The Admin, The casino's mysterious host

• Events with choices, risks, and rewards. 40+ events to discover

• Three stages: Temptation, Greed, and Reckoning. Each with its own enemies, traits, and tone