Pokemon: Rumble World is an action-adventure game for the Nintendo 3DS, released in 2015. It's a freemium game that allows players to collect and battle with toy Pokémon. The gameplay revolves around battling through various levels, capturing new Pokémon, and upgrading the ones they have. The game features over 700 Pokémon from the series, including Mega Evolutions, providing fans with a vast array of creatures to collect. With real-time combat and a simplified control scheme, it caters to both long-time fans and newcomers.