Huh, playing it single player will probably ruin the game, so I'm forcing myself not to play it that way. Seeing as you guys are 100%ing the game and getting bored of it, that would be wise.
Besides, my friend really sucks at it...
He got 10 lives, and when we got to world 2 (besides, we were 3 players, I and my bro included), he lost them all and eventually got game over (luckily, he immediately gets 5 lives right after). He kept yelling "stop killing me stoopid!" "No, you don't need our help to die."...
He got game over 3 times, really! We didn't though.
But the dumb parts are when you turn into a bubble because your friends are going too fast, but right after, all of your allies die, and that is considered as a failure... Interesting, fun.
Our world will stop advancing once humans manage to create sufficient magnificence for a whole lifetime. Until then, I just create.
Awesome video game music on my youtube channel