Shakashaka
Place black triangles so the remaining white areas form rectangles and squares.
Controls
Tap a cell to cycle empty → top-left → top-right → bottom-left → bottom-right triangle. Black clue cells show how many adjacent cells contain a triangle. The remaining white space must split into axis-aligned or diagonal rectangles and squares; white areas do not need to connect. Use Clear or the answer button as needed.
Brain training · PuzGo