For those curious, you absolutely don't have to play Tangle Tower first, The Mermaid Mask is its own story that can be enjoyed on its own terms. That said, it definitely does connect to the events of Tangle Tower in various ways. (Some of those connections are even apparent from the demo...)
The Mermaid Mask - our new mystery detective adventure game (and the follow-up to 2019's Tangle Tower) launches July 16 for PC, PS5, Switch and Switch 2
