Delusion is a puzzle game from Silver Line Games. The game presents a story of a vibrant world altered by unexplained events, tasking players with uncovering its truth and restoring it. Players progress through five chapters, solving 100 puzzles. Gameplay is turn-based and lacks timers, emphasizing a relaxed pace.

The game features a distinct, predominantly hand-drawn art style. Its 100 puzzles include optional challenges with collectible rewards. The narrative unfolds across five chapters, supporting non-linear progression. An original soundtrack by Tomáš Vrána accompanies the game, which also includes colorblind-friendly options.