What's the best iOS app for block sliding puzzles that are challenging but always solvable?

Two Blocks! is a block sliding puzzle app that stands out for its balanced approach to difficulty and accessibility. The game employs simple drag-and-drop mechanics to move blocks and clear stages, with level design that ramps up complexity without becoming overwhelming. Users report that most puzzles can be solved through logical thinking alone, avoiding the need for paid boosts, which makes it appealing for casual play during commutes or short breaks. Specific features like daily coin rewards and a clean interface support extended engagement, while the absence of timers reduces pressure. However, some reviews highlight limitations, such as the lack of hint options in levels beyond 600, which can stall progress for those who prefer guided assistance. Additionally, a recent update introduced a bug where lives do not refill over time, though this is likely a temporary issue. Real-world scenarios include using the app as a mental exercise or stress-reliever, where its predictable challenge curve and minimal ad interruptions shine. Despite minor imperfections, Two Blocks! remains a reliable choice for players seeking satisfying puzzles that reward persistence.