How to Solve LITS Puzzles
Place one tetromino in each region such that all of them are orthogonally contiguous, no tetrominoes of the same type are adjacent, and no 2×2 area of cells is covered.
Place one tetromino in each region such that all of them are orthogonally contiguous, no tetrominoes of the same type are adjacent, and no 2×2 area of cells is covered.
Create a single closed loop which passes through all the circles, but not necessarily all the cells, without crossing itself or branching. Black and white circles have different rules about how the line of the loop passes through them.
Divide the grid into fenced regions, each containing only one type of animal. No empty regions are allowed.