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Soulstack is an idle card RPG that strips away traditional menus and interfaces, replacing them with a tabletop-inspired card system where every action—from combat to crafting—happens through dragging cards onto one another. You awaken in an unknown world with only a mysterious Soulstone and must gradually uncover its secrets by feeding it cards and exploring procedurally-generated locations.

The core gameplay loop revolves around resource gathering, strategic card combinations, and incremental progression. Drag cards to explore locations, gather materials, and engage in turn-based combat against randomized enemy factions. The Soulstone itself serves as your primary interface, growing in power as you feed it cards and unlock new capabilities. Combat is semi-idle, allowing you to step away while your pet familiar continues fighting, creating a natural rhythm between active play and passive progression.

Crafting lies at the heart of Soulstack's depth: you can research and combine over 200 weapon recipes, though only about 40 prove viable—the rest are intentional dead ends that reward experimentation and failure. Alongside weapons, you'll discover a strange creature and guide it through 140 different evolution paths, each unlocking new abilities and playstyles. The prestige system offers 12 distinct classes to unlock through transcendence, fundamentally changing how you approach subsequent runs.

What sets Soulstack apart is its commitment to minimalist design paired with surprising mechanical complexity. The card-dragging interface feels refreshingly tactile compared to traditional RPG menus, while the roguelike structure with prestige mechanics ensures each playthrough feels distinct. The game doesn't hold your hand—many systems reveal themselves through play, and the 20-floor dungeon gauntlet demands both strategic planning and adaptive decision-making.

Soulstack appeals to players who enjoy incremental games, deck-building mechanics, and roguelikes, but want something that respects their time investment. It's ideal for those seeking a game that rewards both active engagement and idle progression, with enough mechanical depth to sustain dozens of hours of exploration and optimization.