Rush Royale, a strategy game based on tower defense gameplay, is free to download and play on Android and iOS devices for free. The game allows players to play against a horde of enemies but also against another player, where every troop you kill on your side reappears on their opponent's side, making the rush even bigger. Players can play solo but the main part of the game is playing with other players. The multiplayer mode is unique as each player protects their castle from the hordes of enemies, which when they kill enemy units, these ones reappear in the other player's part of their screen. Other games include World of Warcraft Rumble, Kingdom Rush, and Bloons TD 6, which does not have a multiplayer mode but offers a well-developed universe with monkeys trying to destroy their enemies.