Scalak is a three-dimensional, tile-matching logic-puzzle game with a sorting element. Against a gradient yellow-orange background, the player must position shapes next to the correct white spaces cut out from vibrant, solid-colored tiles or tile formations. The game features 25 skill levels represented by shaded, round-cornered boxes with no numbers or text. A white box indicates a current, unlocked level.
The player doesn't place a shape. Instead, they position the shape close to a matching cut-out area, and the game drops or pushes the shape into the empty space. Once a shape becomes part of a tile, its edges disappear. In some cases, a shape fits into spaces across more than one tile. No matter the number of tiles, one or more appear solid and whole after shape placement.�
Scalak displays new tile objects and increases the complexity of the objects and shape outlines as the player progresses through the levels. The player must position each shape based on its direction, outline and rotation. This game doesn't penalize a player for making mistakes.
On some levels, the player must rotate a tile object. They might need to select a shape embedded in one tile to prompt the game to remove it, and then place the shape in the correct space on another tile. They might also need to place shapes that act like pieces of a jigsaw puzzle, which means that they might only have pieces of shapes that they must position correctly.
