A1-2

Hint
"Two buttons, one switch!"

This hint is in reference to the internet meme "Two girls, one cup". If you don't know what that is, do yourself a favor and don't attempt to find out.

Solutions

 * (Zero objects) Jump over to the right ledge, getting behind (to the right of) the Boulder. Slowly push the Boulder to the left to make it fall over the edge on top of the Green Button at the bottom of the hole. Repeat this process with the Boulder on the left for the Blue Button. Jump down the whole, flip the Red Switch on the left to gain access to the Starite on the right.
 * Put an Engineer next to the Red Switch.