Thumb candy refers to any computer game that requires little thought or strategy and focusing on hand-eye coordination. The term is a play on eye candy, which refers to visually appealing persons or effects.

Thumb candy指那些仅考验手眼协调能力无需动脑的电脑游戏，有人称之为“弱智游戏”。Thumb candy这个说法是在eye candy（养眼花瓶）的基础上演变而来的，eye candy指外形很惹眼球的人或视觉效果。

For example:

Stop playing those thumb candies, they are not doing any good to you.

别玩那些弱智游戏了，对你一点好处都没有。