Fireflies is a variant of the Japanese game known as Hashiwokakero, or Hashi. In English, the game is commonly known as Bridges.

Fireflies was explicitly designed to be a relaxing game. We feel that many modern games are too much designed to make you addicted. Instead, we hope the puzzles in this game will give you a sense of satisfaction and accomplishment rather than an urge to play the next level.

Fireflies contains thousands of puzzles of several sizes and levels of difficulty. For each puzzle that you complete, you are rewarded a firefly. These fireflies do not serve a specific purpose other than for you to look at and enjoy them.