How to...

play:

1. Click in the Box to jump
2. Red is an obstacle you have to avoid
3. If you lose press "Restart Game" button to reload
    or when the game gets laggy try ctrl+F5/Strg+F5

setup the sound:

Allow autoplay in Browser for the game Site!
1st Look at the search-bar for a symbol like below (Firefox) and click it.

2nd Change from block to allow