√ Root Letter: Last Answer is an interactive mystery visual novel game developed by Kadokawa Games. It is available on Nintendo Switch and offers a full version license. The game falls under the adventure game category and has a single-player mode.

The game follows the story of Aya Fumino, a school penfriend who was allegedly involved in a tragic murder 15 years ago. The player is tasked with exploring the prefecture of Shimane, uncovering clues, and using letters written to each other to track down her childhood friends for questioning. However, it is revealed that these friends, now adults living peaceful lives, might not be willing to let their painful memories resurface. The game is 5GB minimum save size and requires DUALSHOCK®4.