Bloons Adventure Time TD

"Developed by Ninja Kiwi and based on their Bloons Tower Defense franchise, Bloons Adventure Time TD features the Bloon hordes invading the Land of Ooo! Finn and Jake will need all the help they can get to stop them. Players can recruit their favorite Adventure Time characters including Princess Bubblegum, Marceline, Ice King and more, as well as the monkeys from the Bloons TD franchise as they travel from kingdom to kingdom to send the Bloons packing. The free-to-play game will be available this summer."

- Cartoon Network News

Bloons Adventure Time TD is a crossover game between Ninja Kiwi's Bloons TD series and Cartoon Network's "Adventure Time" series. It was announced on March 8th 2018 on the Cartoon Network International News website (and later on other online articles) and on March 9th 2018 in the Ninja Kiwi weekly blogs. Nothing much is known, except the game will be free to play on Mobile devices such as iOS and Android, and is expected to be released around August 2018, according to Cartoon Network's news article.