GAH! So close to the shared heart.
Died in level 45.
I have a tip for you people that are playing solo. I reccomend not being igor and being the other snowman. Try to master using your pinky to reach the bomb button instead of using two hands.
Then put your other hand on igor's keys in case of an emergency.
Oh I want that heart so much!
And to think to unblock it will take 10 times.