Slay the Spire

Slay the Spire fused deck-building card games with roguelite dungeon crawling and created an entirely new genre. Every run is different — you build your deck from random card rewards, choose paths through a branching map, and face bosses that force you to rethink your entire strategy. The mobile version is identical to PC, and the "just one more run" factor is off the charts. It spawned dozens of imitators, none as tight.