Apex Sweeper — Free Sonic Fan Visual Novel

Play or download Apex Sweeper, a free fan-made Sonic-themed visual novel, interactive fiction and puzzle game. Episode 3 is available, with HTML5 browser play and Windows, macOS, Linux and Android downloads. The developer explicitly says the game is freely distributed; the itch.io 'name your own price' download allows a free download (optional contribution). Choose Run Game or Download Now on the developer's page.