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Try to get as far as possible in this blackjack-style endless roguelike!
Play red cards to increase your attack, white cards to increase your defense, and blue/green cards for varying effects. When you're happy with your current attack and defense values, click the bar between you and the enemy to end your turn and initiate combat. After that, your cards get shuffled back into your deck and a new turn begins. There is no limit to how many cards you can draw in a turn (apart from the size of your deck).
Black cards increase your attack, but they also fill up your BUST gauge. If your BUST gauge is full (more than 11 black hearts), you lose all of your attack and defense, and the enemy immediately attacks you for double the damage! Try to avoid BUSTing while still taking a healthy risk and playing as many non-black cards as possible in a turn. Your BUST gauge resets to 0 at the start of every turn.
The black number next to your health bar shows you your current chances of BUSting (number of dangerous cards compared to total cards in your deck) to help you make an informed decision. 
Click on your deck to draw a card or click on the red bar to end your current turn. If you draw a card, click on the revealed card to cast it. Black cards and cards without MP costs *have* to be casted when they're drawn, but cards that cost MP can be skipped by clicking on the two white arrows next to them.
If you beat the red boss skull, the difficulty level increases (+2 black cards in your deck and enemies become twice as strong), but you get to keep your cards and artifacts. Good luck!

Strength = Adds 1 ATK to each red card
STAYING = Card gets shuffled back into deck after playing instead of landing on the graveyard
NUMB = Black cards go straight to the graveyard without having any effect while you are numb
DOUBLE DOWN = If your ATK is greater than the enemy's current LP, any excess damage will DOUBLE DOWN, which means that the overshooting damage will turn into coins

Memories of BUST