Takeshi's Castle", click on it's icon, and then click on 'play' when on its page to enter the lobby. Interestingly, the experience is completely free-to-play, but does offer in-app purchases.

Roblox apparently has done this for some desktop users via its icons. As you’ll see in the tweet below, the game has changed the icons for the player and studio programs.

Roblox is introducing Takeshi’s Castle to a whole new generation. I can only imagine the amount of ‘oofs’ this corner of everyone’s favourite game emits on an hourly basis.