"Pokémon Tower Defense 2" is an unofficial Pokémon-themed game. Players try to stop an army of escaped Pokémon called Rattata from walking across the screen by collecting and leveling up a variety of Pokémon with which to attack the Rattata.
Along with standard tower-defense game rules, "Pokémon Tower Defense 2" incorporates gameplay mechanics from the Pokémon franchise, such as capturing the attacking Pokémon in order to add them to the team.
Tower defense has become a popular genre, from popular games such as "Plants vs. Zombies" to independent free-to-play games on websites such as Newgrounds. The goal of a tower defense game is to defend a point on the screen which is being attacked by oncoming enemies.