Undertale Multiversal Calamity: Black Label is a free-to-play game available on the Roblox platform. Developed by Undertale Multiversal Calamity, this game is currently in beta and is still incomplete. The game features a FFA (Free For All) Undertale gameplay with some added tweaks to make the gameplay slightly more complex.

In Undertale Multiversal Calamity: Black Label, players are required to have an account that is at least 75 days old to participate. The game also includes flashing lights, so players with sensitivity to such visuals should be cautious. Additionally, the servers for this game shut down every 4 hours, although private servers are exempt from this.

One of the key mechanics in the game is the acquisition of Essence, with players receiving 30 Essence every 4 seconds. It's important to note that the Power/Essence scaling in the game is not meant to be fully canon, but rather a gameplay perspective. Therefore, the cost of certain characters may differ from what is expected.

Overall, Undertale Multiversal Calamity: Black Label offers an engaging FFA Undertale experience with added complexity. Although still in beta, the game shows promise and will continue to evolve as more features are added by the developer.