Hi everybody, the underground was re-opened today! The window is finally fixed and the water is being drained at the moment of this post.
But the really cool thing is, there are new tricks on the Cart Surfing game! (I counted 3)
Here is some of the new tricks,
1) (Run with Cart) It kinda looks stupid but its a big pointer trick. (80 pts.)
How to do it: Hold the down arrow key and then hit Spacebar (↓, space)
2) (Stand on front of Cart) Be careful you don’t fall off. That would be nasty. 
(40 pts.)
How to do it: Hit the up arrow key twice (↑,↑)
3) (Quick Drop) Sometimes you jump when you don’t mean to. Well now you can turn your accident into a trick worth something! (30 pts.)
How to do it: Hit Spacebar and then hit the down arrow key (space, ↓)
