A few months ago, indie developer RetroSpecter noticed something unusual about Crashphalt, their first completed game that launched on Steam in 2018: Since their last check-in on the neglected platformer, Crashphalt had suddenly gained over 500 reviews. In its first four years, it had barely managed a dozen.And almost none of those new reviewers had anything to say about Crashphalt itself. Mostly, they just talked about Undertale.(Image credit: Cold Pressed Games)"Does ANYONE want to play Undertale with me???" one reviewer writes. Another calls Crashphalt the "best game to never actually play." Others insist that "Undertale is a pretty cool game.""Okay yeah I like Undertale too," RetroSpecter wrote in a Reddit thread recounting their discovery, "but wtf is going on?"Crashphalt owed its unexpected renaissance, they soon realized, to Undertale Together, a fan-made Undertale multiplayer mod that, typically, only supports local co-op—a limitation that players found a clever way to circumvent.