Note: Because this is a Tavern Brawl, games played in this mode do count towards completing daily quests, even though the games are not played against other humans.
The objective of Blackrock Crash is to defeat eight bosses of increasing difficulty to win the run.
The player begins with a collection of ten cards, consisting of different cards for each class.
The player starts on 15 Health, and gains additional Health per defeated boss, up to 40 Health for the eighth, and final boss.
After rounds 1 and 5, the player receives a Passive buff, selected from one of three random passive buffs from the pool of Passives.
These passives give a permanent effect to the player for the rest of the run. These are applied at the start of the match, meaning some buffs that affect cards will not affect cards added to your hand or deck later in the game.
After rounds 3 and 7, the player receives a Treasure card, selected from one of three random cards from the pool of Treasure cards. These are very powerful cards, and often have low mana costs.
After each round, the player is offered three bundles of three cards each. The player can only select one of these three bundles. This allows the player to increase their deck size in tandem with the boss' decks increasing in size.
Should a game end in a tie, the player will be given the chance to try the round again.
The player always goes first. The enemy also does not get The Coin.