NOTE: Hats A1, E6 and F10 are not found in the levels. Check the index part.

Season 1 (A to E, 1 to 6):

World 1:
1-1: B3
1-3: A4

World 2:
2-1: B1
2-3: A3
2-4: A2
2-5: B5
2-6: C5

World 3:
3-3: B6
3-4: A5
3-6: B2

World 4:
4-1: C3
4-5: C2
4-6: C4

World 5:
5-1: B4
5-2: C6
5-3: C1
5-5: D1
5-7: E1
5-8: D5
5-9: D3
5-10: D2
5-11: D6

World 7:
7-1: D4
7-6: A6
7-8: E4

World 8:
8-3: E3
8-5: E5
8-6: E2

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Season 2 (A to E, 7 to 10; F 1 to 10)

World 1:
1-3: F1
1-4: F2
1-5: F3
1-7: F4
1-8: E10
1-9: F7

World 2:
2-1: F5
2-2: F6
2-3: F8
2-4: A7
2-5: A8
2-6: A9
2-7: A10

World 3:
3-3: B7
3-4: B8
3-5: B9
3-7: B10

World 4:
4-1: C7
4-3: C8
4-6: C9

WorLd 6:
6-1: F9
6-3: E8
6-9: E9

World 7:
7-1: C10
7-3: D7
7-4: D8
7-6: D9
7-7: D10
7-8: E7

Season 1 (A to E, 1 to 6):

A1 - Default. You start with this one.
A2 - World 2-4: Right at the start, boost yourself through the gap in the ceiling.
A3 - World 2-3: Obvious.
A4 - World 1-3: Jump on top of the door arch, then boost up and over the level to the right.
A5 - World 3-4: On top of the first big pillar thingy. On top of the level.
A6 - World 7-6: At the end, go under the portal and up the little hole in the top right.
B1 - World 2-1: Jump over the portal at the end, and then drop out of the level to the right and quickly push left.
B2 - World 3-6: Boost yourself over the level and to the left at the start.
B3 - World 1-1: Right after exsiting the house at the start, jump on top of the house.
B4 - World 5-1: Just go down the big ramp over the spikes.
B5 - World 2-5: Just climb onto the top of the level and go right. The hat is on a ledge on the left when you fall down on the other side.
B6 - World 3-3: On the spikes on top of the level. Boost yourself there from the first platform.
C1 - World 5-3: Just boost left and slightly upwards as you hit the first bouncer and make sure you land on the platform.
C2 - World 4-5: Go down the last lake to the right.
C3 - World 4-1: At the bottom of the very first lake.
C4 - World 4-6: Instead of going up the water, go to the edge at the start and boos right. The hat is low on the far right.
C5 - World 2-6: Jump on top of the destroyable blocks at the start and you should be able to reach it.
C6 - World 5-2: Tricky. As soon as you hit the bouncer, thrust downwards and a bit to the right and try to land on top of the level. After that jump over the spikes to the right and try to aim for the hat.
D1 - World 5-5: Just push left on the beam, and you should star moving towards it.
D2 - World 5-10: Obvious.
D3 - World 5-9: On the last three beams, let yourself go all the way to the left on the top one.
D4 - World 7-1: Think fast! As soon as you can, fire to the left! The hat in near the spikes a t the top of the shaft.
D5 - World 5-8: Keep boosting up after you hit the first bouncer.
D6 - World 5-11: Hard one. DON'T GO LEFT! Instead, go up the ramp to the right almost to the bouncer. Then jump and push right against the wall. you should slide down the wall to the bouncer. As sooon as you hit it, fire left and down at a 45º angle and your should land on a platform on the top left. Then just jump through the hole in the ceiling and the hat is to the right.
E1 - World 5-7: Just let yourself be caught in the beam on the right.
E2 - World 8-6: Fall through a small gap in the first layer of spikes.
E3 - World 8-3: On the portal platform, instead of going in, boos over the billboard in the middle. The hat is on the left side.
E4 - World 7-8: Obvious.
E5 - World 8-5: Just adjust yout trajectory slightly after hitting the bouncer.
E6 - Collect all the other hats in Season 1 and you get this one. (Thank Kawalté for this one!)

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Season 2 (A to E, 7 to 10; F 1 to 10)

A7 - World 2-4: Don't grab the cake. Instead, go down the ramp and boost onto the opening. Then jump out and grab it.
A8 - World 2-5: Tricky one. Do as you would to get to the second piece of cake (boost as soon as you hit the spikes). Once you're on the ledge, instead of grabing the cake, boost over the wall of spikes to the right.
A9 - World 2-6: Trial and error. After you manage to land on the ledge without grabing the cake at the start it's pretty easy.
A10 - World 2-7: Grab the cake and roll as you would. As soon as you hit the spikes, start boosting towards the ('I put on my robe and wizard') hat.
B7 - World 3-3: Land on the edges of the last yellow stuff pool before the exit and boost up. Be careful, if you miss you might hit the portal.
B8 - World 3-4: Obvious.
B9 - World 3-5: Next to the right wall on the big pool of yellow goop. MUAHAHAHAHA!
B10 - World 3-7: Obvious.
C7 - World 4-1: Let yourself fall in the first pit.
C8 - World 4-3: In the portal chamber, fling yourself unto the right wall and then onto the ceiling. Then just walk along the ceiling.
C9 - World 4-6: Fling yourself upwards (remember you can fling in mid-air, so no need to risk the spikes) but be careful as you approach the portal. Try to land just over the spikey bit on the left wall, then inch your way onto the ceiling.
C10 - World 7-1: Get on the first ledge, the just go up hugging the wall (hold left mouse, then click right mouse).
D7 - World 7-3: Directly up from the start platform.
D8 - World 7-4: Bottom of second pit. Hard to miss.
D9 - World 7-6: Just let yourself fall all the way down the pit.
D10 - World 7-7: Top right corner. Easy once you're on the portal platform.
E7 - World 7-8: Almost under the portal. Get on the little ramp on the start. Then aim your guns left and downwards (~30º) and fire and hold both. Might take a few shots.
E8 - World 6-3: There is a gap in the left wall at the start, about mid-way up. Go through it and let yourself fall of the level.
E9 - World 6-9: Get near the portal. If you spray upwards you should flnd a hole in the ceiling, with a little tunel. Get to it. The jump out of the tunnel and out of the level upwards. once you're on top, just keep walking left until you get it.
E10 - World 1-8: Put yourself directly under the hat. Then click and hold inside the ceiling (yeah, you can do that).
F1 - World 1-3: Obvious
F2 - World 1-4: Kinda hard to reach, but obvious.
F3 - World 1-5: Obvious. Remember that if you click just outside the blue area and time it right you can almost hover.
F4 - World 1-7: Hard to reach. The best way is to click and hold in the area where the hat is so that you keep pulling yourself towards the wall. Then let go and after the guy has dropped below that wall click and hold INSIDE the ceiling above the hat.
F5 - World 2-1: Go under or over the cake, and then boost your way on top of the wall to the right.
F6 - World 2-2: From the hovering platform at the start, boost over the cake to the left and you should see it.
F7 - World 1-9: Pretty easy. Just fling yourself to the last platform and then drop.
F8 - World 2-3: Obvious. Just boost over the cake and grab it.
F9 - World 6-1: Jump on top of the house. There is a platform about 5-guy-lenghts above it. Boost on top of it. Then just boost upwards and you should see it.
F10 - BUY ALL THE OTHER HATS AND GET THIS ONE FREE! (it's free for a reason, you'll see)