Slay the Spire

Slay the Spire fused deck-building card games with roguelite dungeon crawling, selling over 3.5 million copies since 2019. Every run is different: you build your deck from 250+ random card rewards, choose paths through a branching map, and face 3 distinct final bosses per character. The mobile version is identical to PC and console, including all 4 characters with 75+ relics each. It's 50% faster to complete a run than #4 Among Us's 15-minute sessions, yet the "just one more run" factor hooks players for 100+ hours.