I'm at the level in the jungle. And I'm at the part where there is a big boulder in the way.

I went through every inch of the level I could without cheating, and no matter what I did I couldn't find a way to progress in the level.

I destroyed the crate, but that didn't do much.

I want to move the boulder to the left, but I can't, I tried, I can only move it to the right, but if I do that I block the path to the next checkpoint, I'm stuck and have no idea what to do.

I'm not gonna use a cheat code as I wanna beat the level legitimately. Can someone help me out?