Who Killed My Sister? is a free strategy game for Android developed by GOLDEN DOG K.K. The game is set in a murder mystery scenario where the player has to solve riddles to uncover the truth behind the murder of the protagonist's sister. The game consists of multiple levels, and the further the player progresses, the closer they get to the suspect.

The game has an intriguing storyline that keeps the player engaged throughout. The gameplay is challenging, and the riddles are well thought out. The graphics are impressive, and the sound effects add to the overall experience. Who Killed My Sister? is a game that is sure to keep players hooked until the very end.