Might be better to do a video tutorial

I forgot to mention about the Last Extra stage with the piano rhythm game, use a keyboard; the keys I used were 'A' and 'D', the contoller was way too hard.

For the final Extra Stage, it's a piano thing. I hope you're good at rhythm games. Don't despair though, you can get 12,000 pts. There's 2 parts to the song, the first part, the middle, then the first part repeats. You cannot make a single mistake on the first part, which will net you a 9.9x multiplier (and also the bonus). You must get that multiplier, then try to get as far in the middle as possible. Once the first part repeats, you cannot make another mistake until the end. If you do both first parts and miss almost all of them in the middle, you'll still get over 12k

For the two extra stages after the boss:

The numberflop game is kinda confusing. You start with 1 and you want to try and get as many combos as you can; ideally, 1-2-4-5-Reverse-5-4-3-2-1-Reverse-1-2-3-4-5, etc, etc. If you press a 1, then press a reverse, you'll need to find another 1, like if you're on a 4, then hit reverse, you'll need to find another 4 to keep the combo going.

To do the bonus, you either need to find a 1 that doesn't have a 2 or a Reverse next to it. So find those first. Otherwise, you'll need to start at 1, then go to a Reverse that is NOT adjacent to another 1. Do this 5 times and the bonus is easy. Remember, it's less than 10, if you get 10, it won't pop.

Popcorn Bowl : the microwave effects its trajectory, so stay close to the left hand side, then move out to the right, throw on the wave, then quickly move back to the left corner so all the popcorn pushes itself to the left wall.

Lawnmowers : Never decouple (unless you're practicing) and just focus on one, moving carefully and always take wide turns when you're passing the other mower.

Penguin : do circles, you can pass over your trace.

Bowling : just takes a lot of trial and error

Boss : The sound button is on the left, you want to hit the top of it. You should end the first phase in a single try, restart if you don't get it. For the bonus stage, try to push it as far to the right as possible on the first phase, then try to get all the buttons. It may take you a few times inputting codes since it's real sketchy on what buttons you hit.

For 100%:
Anti-Eraser : Get real familiar with the controls, then once you restart the level, immediately cover the bottom part of the board in one go (head up a bit and immediately take a right). Leave the last bit on the lower left for the very end and then erase horizontally. You just have to take some smooth turns and not go too far off the board, you just have plenty of time.

Cheese Eater: Hold down either left or right and the mouse will spin in a perfect circle, easy.

Water Ballon : Easy strategy about 0.5 seconds after a round starts, dive at it, let the other fish counter, and then forward roll and hit it with your tail. Or just follow this guide, lay flat, once the other fish puts it on your head, you need to get it as high as possible, the forward hit it with your tail. I can get it over the opponents head almost every time. if you get 4 up, just hold the ballon until time runs out.

Helpful guide, especially with the popcorn. Made that one a non-issue. I was surprised I got through the skateboard one in a single try when the stupid mushroom wheels gave me so much trouble lol.