Leave it open - it's designed to run in the periphery of your life. Only interact with it when you feel like it. You can play Mountain while playing other games. If you are not playing it, it will play itself.

If you're having an annoying storm or boring night, play a melody (using your keyboard) and time will accellerate.

Certain melodies unlock certain modes which get saved in your songbook. Here are some to get you started:

Blood mode : mmmmmm,mnab
Snowglobe mode : bbbbbcb
Fish : cxzxccc xxx cbb

You can also trigger a thought by hitting period (.)

You might recieve items on your Mountain. In this version of the game you can rearrange them by clicking & dragging - and do some other things.

Have fun!