You can skip many tasks by glitching through the object that is blocking your way. There are multiple methods to achieve this.

Methods

Method 1

1. Go in front of the object until you can't continue walking. If you start running towards the object from a certain distance, you will already walk into the object a bit. This distance is different for every obstacle.
2. Press the key to the opposite direction briefly. You should only turn around but not walk in the direction.
3. Now turn around again normally. You will walk into the object a bit.
4. Repeat step 2 and 3 until you can pass the object.

Method 2

This is the same like Method 1 but at Step 3 you do this instead:

• Turn around again and press the direction key repeatedly as fast as possible. If you are lucky you can make two or more steps into the object.

Method 3

This is nearly the same like Method 2, but here you press the direction key repeatedly before turning around completely. You should wait for about half the animation before heading back to the obstacle.

Method 4

You can combine this method with any of the other methods. After step 1 do a high jump and start the helicopter. Fly towards the object. You should be able to jump over a invisible barrier and into the object.

Pass barriers

Certain obstacles do have extra barriers which you can pass by doing 2 steps at once right before hitting them.

Skippable Objects

Level Select

Greenhouse Door

Method: 2
Distance: ?
Perfect Number of Turn arounds: ?
Further notes: 2 barriers (1: Feet just covering a dark stone on the ground, 2: Foot partially invisible, small part on left visible)

Furnace Door

Method: 2
Distance: Left edge of the staircase
Perfect Number of Turn arounds: ?
Further notes: 2 barriers (1: left edge of the box in the background, 2: at closed furnace door); Must continue crouched near the furnace

Window next to Dinosaur Level

Method: 2
Distance: ?
Perfect Number of Turn arounds: 2
Further notes: Jump towards the window and use Method 2 in air. Then use Method 2 on the very small platform part until you passed the window.

Level 1

Monkey

Method: 1 or 2
Distance: ?
Perfect Number of Turn arounds: ?

Guy who wants chicken

Method: 2
Distance: Third brown line near the arrow in the background
Perfect Number of Turn arounds: 2 (2 x 2 steps)
Further Notes: You can also skip him by repeatedly helicopter jumping towards him.

Level 3

Dog

Method: 4 combined with 1
Distance: Jump from about the pillar near the arrow in the background
Perfect Number of Turn arounds: 1
Further notes: Turn around again in air as soon as your head is under the top of the door to go through it before touching the ground.

Level 4

Dynamite

Method: 4 combined with 2
Distance: Spawn
Perfect Number of Turn arounds: 1 (1 x 2 steps)

Door which requires diamond (left to right)

Method: 2
Distance: ?
Perfect Number of Turn arounds: ?

Door which requires diamond (right to left)

Method: 2
Distance: ?
Perfect Number of Turn arounds: 2 (1 x 2+ steps)

Stone Block inside pyramid

Method: 2
Distance: ?
Perfect Number of Turn Arounds: ?
Further Notes: Run on the small platform below before jumping upwards. If you are lucky you can skip a big part of the barrier.

Level 6

Stone Block next to the beginning

Method: 3
Distance: Beginning of bridge (easy); One step forward (hard)
Perfect Number of Turn arounds: ?

Burning Fire

Method: 1
Distance: ?
Perfect Number of Turn arounds: ?

Gate near Key

Method: 4 combined with 2
Distance: ?
Perfect Number of Turn arounds: 4 (4 x 2 steps)

Level 8

Gate with skeleton

Method: 1 or 2
Distance: ?
Perfect Number of Turn arounds: 1 (1 x 2 steps)

Level 11

Jack's Club door

Method: 2
Distance: ?
Perfect Number of Turn arounds: 1 (1 x 2 steps)

Bombable Objects

There are several obstacles that must be bombed away with bombs or candles (Level 8).
These obstacles prevent you from turning around once you are too close to them. However this blocking only works when the thought bubble is visible.
Therefore you have to jump in order to despawn the thought bubble for a short moment and then turn around in air.
It's harder to turn around only and not do one step on these obstacles than it is on the normal ones. You can constistenly not do steps by using the attack while turning around. This way you will not move away from the obstacle.

These items are skippable only by this method:

Level 1

• Box 1
• Box 2

Level 3

• Wodden planks

Level 4

• Stone Block 1

Level 6

• Lower Stone Block

Level 8

• Barrel near ticket
• Barrel near pillow (left upwards)
• Barrel near pillow (right downwards)
• Barrel in "Secret" room at beginning

Unskippable Obstacles

There are very few obstacles that you cannot skip by any of the methods. These obstacles are:

Level 3

Guy who wants toilet paper: Key only spawns when you bring the toilet paper to him.

Level 8

Monster near alarm: There is apparently no way to make the thought bubble disappear, therefore you can't turn around here.

Level 11

Barricaded Window near key: You can not skip it directly but there are a lot of copies of the windows in this level which you can use to enter the room.