Only a few challenging puzzles, and about 30-40 of the 100 puzzles were filler (solved with a single obvious move) and maybe another 10-15 were solved with two obvious moves.

Considering the price, I don't mind, but chess-based games REALLY need the ability to drag and drop pieces to move. Clicking twice for each move gets tedious very quickly.

Some puzzles later on have an important marker on some squares which often start obscured by pieces which is annoying.

Only a few challenging puzzles, and about 30-40 of the 100 puzzles were filler (solved with a single obvious move) and maybe another 10-15 were solved with two obvious moves. Considering the price, I don't mind, but chess-based games REALLY need the ability to drag and drop pieces to move. Clicking twice for each move gets tedious very quickly. Some puzzles later on have an important marker on some squares which often start obscured by pieces which is annoying.