|N version||1.3 and later|
Method 1 (Easy)
For speed, just run right.
However, considering that cubish is the next level, it would be smart to gather as much gold as possible in this level. Gaining access to the first two doors on the bottom is fairly simple. Hit the launchpad, and walljump off the first bounceblock to your right. All of the door switches are hidden behind the blocks; when you walljump off the block, you will collect switch. The propulsion will send you to the block that is slightly above and to the right of this one. Get that switch, then hop over to the left (wary of the gauss turret) and first hit the bounceblock towards the top-left, directly underneath a single mine, then the bounceblock on the very bottom left. These two open up the second door.
Drop down, pick up the gold in the first room, hop over to the second room, get the remaining gold, then finish.
If possible, shoot for even more gold, though it may become slightly time consuming. The following image shows the location of all of the doors.