This is a very annoying level - designed specifically to dump you back at the start whenever you make the slightest mistake.
1) This is just above the start, and is probably an easier way to get out of this corner than to bounce up again past the spikes.
2) This one is quite a long way into the level. You'll find a large room filled with disappearing platforms. If you continue to the left of this, down past a swinging spiky ball, you should find this passage in the right wall.
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Return to Level 3-3
Continue to Level 4-1