All Sly 1 level skips

(Written by Paul)
Paris - you can skip the tutorial level by doing a jump to avoid the death barrier.

A Stealthy Approach - can fly to the end but not viable yet.

A Cunning Disguise - proxy skips the level.

The Gunboat Graveyard - the guard can be used to fly to the end level trigger.

A Rocky Start - can fly to the end with roll and invisibility, big part of level skipped using binoculars or non abilities.

Boneyard Casino - can fly to the roulette wheel.

Two to Tango - can fly to the end by using fast and moving invisibility.

Straight to the Top - already had a level skip and it is consistent but you can also use fast and moving invisibility to proxy off the arrow sign and land directly on the wrecking ball.

The Dread Swamp Path - can fly to the end using roll.

The Lair of the Beast - going out of bounds skips most of the level.

Piranha Lake - can clip through a precise spot next to the gate to skip the level.

A Grave Undertaking - going out of bounds at the beginning basically skips the level.

Descent into Danger - can jump far enough into the water to skip the level.

A Perilous Ascent - can fly over the gate by using roll.

Unseen Foe - invisibility proxy, skips most of the level.

Rapid Fire Assault - can skip the level by spinning in a corner to get out of bounds and landing on the pillar to collect the key.

A Desperate Race - can skip the level by using a nitro boost to get over a snow slope.

Bentley Comes Through - Turret is used in A Daring Rescue to get launched over a cutscene trigger towards the load zone for A Temporary Truce to bypass the hacking level.

Sinking Peril - cane jump skips most of the level.