You get this for beating level 9.
1) Click the top right snowflake twice to drop the icebergs in the back down enough to reveal the first coin.
2) Now click the left snowflake 3 times to lower the left iceberg, allowing the sun to shine through and melt the ice around the chair next to you.
3) Click the chair to climb on. Click the green light on the back of the chair to warp to the next area.
4) In the lower left of this area is the second coin, hidden behind the metal ring in the corner.
5) Click on the little blue thing in the purple bush to go pick it up.
6) Climb back into the chair, and click the red button to go to the third area.
7) In the top left of this area, behind some plants, is the last coin.
8) There's a small hole on the ground in front of the chair. Click it to have your caterpillar wiggle through to the plant on the other hole.
9) Click the plant the caterpillar is on to move it to the first hole, and then climb back into the chair. Go to the blue ice area again.
10) Here, click the middle snowflake until the iceberg is stretched off the screen. Go to the green area.
11) You'll see the ship in the background sinking as you enter the area.
12) Head immediately back to the red area, and move the caterpillar bush back to the left.
13) Back to the green area. The tornado follows the bush, and will pull a bottle out of the water when you arrive.
14) Pick the bottle up and use it on the puddle to fill it with water. Return to the red area.
15) Here, click on the caterpillar tree. Then click on the yellow smoking thing in the back to heat up your water bottle.
16) Go back to the blue area. The caterpillar has turned into a butterfly, and is frozen where you left him in the red area. Use your water bottle on the ice to melt it.
18) Give your empty bottle to the possum things in the middle of the area.
17) Pick up the now thawed butterfly, and return to the red area. As soon as you arrive the butterfly will eat the caterpillar, getting you an achievement.
18) Click one of the eyes in the middle of the level to squish them into one blob. Return to the blue area to see that the possums are now a yeti?
19) Click the left snowflake to reveal the sun again, and the light will release the firefly.
20) Click it to beat the level!