This is a little guide to help you navigate this very confusing bonus level to help you get that golden coin.
It isn’t immediately clear which launchpad leads where. So I went and mapped it all out.
Each path starts at the launchpad with the respective colour dot on it. The green and blue path end in the far tiles on the center platform, the others merge with another patch. The golden coin will most likely appear on the bottom middle platform, so as soon as you see it take the yellow path.