The choice of game engine would depend on the specific features and requirements of each game:

1 - Unity or Unreal Engine 4 would be suitable for a first-person shooter and farming hybrid game.
2 - Unity or Unreal Engine 4 could also work for a monster catching game.
3 - A custom engine or a combination of tools such as Firebase and Unity or Unreal Engine 4 could be used for a game where all players can do a single action per day.
4 - Unity or Unreal Engine 4 would be a good choice for a city management game with a twist of super heroes.
5 - Any 2D game engine such as Construct or GameMaker Studio could be used for an idle game.
6 - Unity or Unreal Engine 4 would be a good choice for a tower defense game with RPG elements.
7 - A custom engine or blockchain-based platform like Enjin would be suitable for a blockchain mecha game.
8 - Any 2D game engine or a combination of tools such as Construct or GameMaker Studio with custom code could be used for a card game where you manage a farm.
9 - Unity or Unreal Engine 4 would be a good choice for a keyboard-piano game where playing specific songs casts spells.
10 - Any 2D game engine such as Construct or GameMaker Studio could be used for an infinite clicker game that utilizes generated images.
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