How do you beat the game snow line

*There is a video walkthrough at the related link below*

Draw a line (of snow) from under Santa's sleigh, that he can move down to collect the gifts. Then press the green "play" button at the top to start him moving. Too shallow a path will let him stop. Too steep a path will cause him to tumble over. Dropping him onto a cloud will carry him to near the end of the line of triangles.

Level 1 - Sleigh Ride (gently curved line passing through all the gifts)
Level 2 - Downhill Dash (catch him with a ramp when he falls off the cloud)
Level 3 - Mountain Melt
Angle the path down sharply, then up at the present next to the warm updraft, so that the sleigh can fly over it to reach the next present (separate snow line).
Level 4 - Whiteout Peak
Make a sharp down path staying left of the whirlwind, to hit the first present. The small power-ups will speed Santa up along a path to the right
Level 5 - Fire Ride
The triangles will carry Santa across the hot air. Make a path to the next present below.
Level 6 - Snow Train
Build a steeply sloping ramp to the gift and the lower tunnel.
Level 7 - Ice Tunnel
This requires Santa to slide backwards (left) twice. Build over to the first gift, then leave a space and build a ramp below that slants back to the left, past the second gift, then stops above the lower left tree. Build a ramp from there sloping back to the right, through the "Santa shrinker" to the tunnel.
Level 8 - Twin Plumes
Lead Santa onto the clouds that carry him across the plumes. At the upper right, he will stop and roll backward to the lower cloud after getting the gift.
Level 9 - Chaos Canyon
Stop Santa from hitting the whirlwind, then slant across the train bridge and get the key, then through the unlocked tunnel.
Level 10 - Magma Cavern
Stop Santa and turn him back to the left, down, right into the magma cavern, cover the hole and cover the up route to drop him to the flag
Level 11 - Snow Chute
Let Santa jump *over* the cloud, to roll back left into the *bottom end* of the cavern (to get the gift), then back out the top -- build a "snow ceiling" to guide him to the cloud.
Level 12 - The Summit
Use the power-up to jump the hot air, to reach the gift at upper right, then stop at the whirlwind, then across to left and stop, angle down right to the gift, then second power up. Use a ceiling to force Santa into the magma chamber, and cover the inside hole.

(see the related video link)