Undertale: Timeline Collapse is a Roblox game developed by kamilderboii. It is a free-to-play PvP style game that offers a variety of features, including fighting other players, roleplaying, completing challenges, and defeating bosses. The game is based on the popular game Undertale by Toby.

In Undertale: Timeline Collapse, players can collect unique characters, each designed to be more unique than the other. The characters vary in rarity and price, with more expensive characters offering more variants. This adds a layer of customization and personalization to the gameplay.

To stay up to date with the game and get access to codes, players can check out the official channels and be a part of the community. However, it's important to note that the game is still in beta, so there may be some bugs or issues.

Overall, Undertale: Timeline Collapse offers an engaging PvP experience with roleplaying elements and challenges. It's a game that fans of Undertale and PvP games will enjoy. Just keep in mind that your account must be at least 7 days old to play.