Stack Sorting

Stack Sorting is a puzzle video game in which the player manages a sequence of colored or numbered blocks stacked in vertical columns. The core objective is to rearrange these blocks into a single sorted stack, typically by color or numerical order, using a limited set of operations. The game presents a series of levels, each with an initial configuration of stacks and a designated number of empty auxiliary stacks. The player must move blocks between stacks, adhering to a rule that only the top block of any stack can be moved at a time. The challenge lies in planning a sequence of moves that avoids deadlock, where no further legal moves are possible. The game is a digital implementation of the classic sorting puzzle, often featuring increasing complexity through additional colors, larger stacks, or restricted move counts. No narrative or character elements are present; the game focuses entirely on logical deduction and spatial reasoning. The visual interface typically displays stacks as vertical columns on a grid, with blocks rendered as distinct colored or numbered squares. The game provides feedback on move legality and level completion status.

The player interacts with the game using a pointing device or touch input. To move a block, the player selects the top block of a source stack by clicking or tapping on it. The block is then lifted from the stack. The player then selects a destination stack by clicking or tapping on its top. The block is placed on top of the destination stack only if the move is legal. A move is legal if the destination stack is empty or if the top block of the destination stack is of the same color or a higher numerical value than the moved block, depending on the specific sorting rule of the level. The player can cancel a lifted block by clicking on the source stack again or by pressing a designated cancel button. The game interface includes a move counter that tracks the number of moves made. Some levels impose a maximum move limit for completion. A restart button resets the current level to its initial configuration. The game provides a visual indicator, such as a highlight or outline, on the block currently being held. Level progression is linear; completing a level unlocks the next. The game does not include a pause function, as moves are discrete and non-time-sensitive. The controls are limited to selection and placement, with no keyboard shortcuts or alternative input methods.