Nurimaze

Nurimaze ("Nurimeizu") consists of a grid divided on regions. The aim is to blacken some regions according to the following rules:

• Cells with letters, circles or triangles are always white.
• White cells form a path from a cell with S (start) to a cell with G (goal); a path must be exactly one cell wide.
• A path from S to G includes all cells with circles and no cells with triangles.
• No 2 x 2 cell area within the grid can have the same color.
• All white cells must form an orthogonally continuous area.
• White cells must not form a loop.

Cross+A can solve puzzles from 3 x 3 to 30 x 30.