This game is using Flash! After the 31st of July 2019, your internet browser might start blocking Flash, especially if you use Google Chrome. This means you'll have to activate it to play this game.
Nimble Mario 2 is a funny 2D Mario platform game, all you need to do is: jump on the blocks, collect coins, find keys to open all doors and pass to the next level. Overall a pretty good game. Let use your cunning and skills to find the secret passage. Good luck!