How do I earn credits to teach Chop new tricks?

Here's what I've figured out:

The credits you can earn are pickup-items that show up in the mini games. They appear as gold coins with the letter "C" on them. They show up at random but it looks like you have to stay alive in the mini game for a while before they have a chance to appear.

• The Beach game is easiest to stay alive in, but I've also gotten a good amount of credits to show up in the Park game.

• The Street game is difficult and frustrating, and I haven't seen a gold coin there yet.

• If your goal is getting coins, don't worry about your score. Play the game just well enough to stay alive.

• Pick up the blue clocks to add time to the game. You have to stay alive long enough for the coins to show up.

• Pick up the "JUNK" soda cans for a speed boost. The boosts are stackable, so if you pick up multiple soda cans you can tear ass all over the level, increasing your chances to do whatever you need to stay alive.

• Avoid the beer bottles. These slow Chop down.

• The baggie of white drugs makes the screen wobble. I don't think it does anything else, so avoid it if you can.

• I don't know what the Sprunk cans or bottled waters do.

• Every time you play a minigame, Chop's water, food, and happiness meters go down. Make sure you save enough of the credits you win to keep him maintained.

If you have figured out anything I've missed, let me know.