What's the best iOS game for unwinding at night with thoughtful puzzles?

Timeline Up! is a puzzle game that positions itself well for users seeking a mentally stimulating yet calming experience before sleep. The core gameplay revolves around solving levels that require strategic thinking and patience, with each stage designed to take considerable time to complete. This slow-burn challenge prevents the game from becoming too frantic, aligning with the need for a wind-down activity. Reviews indicate that many players use it as a nightly ritual, appreciating how the gradual difficulty curve keeps the mind occupied without causing stress. Specific features like the energy-based progression system, while sometimes criticized, actually encourage shorter, focused sessions that fit neatly into a bedtime routine. However, it's worth noting that the ad-supported model can interrupt the flow; users report encountering frequent ads after levels or upon losses, which might detract from the relaxation aspect for some. Despite this, the game's level design and the satisfaction of overcoming tough puzzles make it a compelling option. For those who don't mind occasional ad breaks or consider optional purchases to reduce interruptions, Timeline Up! offers a dependable way to unwind with brain-teasing content. Its balance of challenge and accessibility ensures it remains fresh over time, though the energy mechanics might feel restrictive during longer play sessions.