I am stuck on jokes mountain, can I reset that stage?
There is no mechanism to reset a location.
Look for links for screen maps and videos at the top of this page:
How/where are you stuck?
Screenshots & the more detailed information you can provide makes it much easier for other players to be able to assist you.
Along with the wiki page that red_herring supplied to you in the above post there are also walkthroughs, videos, maps, guides & hidden gifts/bonuses contained in many useful & informative threads in this forum