How do you beat level 15 in primary in less than 1.5 minutes?

Answer 1

Run right and drop the ice cube, then without jumping on the ice, flame jump up to the blue platform and make your way up the corridor. When you reach the top, run to the right and flame jump up the wall to the middle platform, then flame jump up to the landing on the right and kill the Mega-Stalker, and drop a portal. Flame jump up and cling to the wall on the right, then jump onto the platform on your left, then flame jump up to the switch and hit it. Drop your other portal and go through to get back down to the landing, and normal jump to the middle bit, then normal jump to the left, and wall jump to the landing next to the black spikey. From there, flame jump to the landing above you. Claim your checkpoint, then wall jump up the left side to the narrow platforms. When you're hanging on the platform on the left, you can jump to get directly to the right hand one, and flame jump up to start your wall jump ascent up the right side. When you're either hanging on the ledge of the landing at the top or standing on it, flame/power jump up to the blue platform, drop some ice, jump to the first red platform, then flame jump to the landing on the right. Turn yellow and go invisible to slide through, and after you fall down, flame jump up the left side and grab the ledge, then power jump up to the next ledge, then flame jump up the wall and you'll be at the top. Now it's time to drop down the middle to get to the elevator. Be red down the middle, then yellow down the right, then drop down and exit.