On mine cart press down+space to do the backflip then do space+left or right to do the 360. crash evrytime you get 1000 points besides the when u get to 4000 if done correctly u can usally finish with 420-440 coins.
Press the red bar at the botom of the PIZZATRON 3000 to change it so you make candy pizza horray!!!! 
The better part is u get double the money.
On the jetpack game if u can go through the whole thing without getting a single coin they give you like one thousand coins.
On the surfing game press the arrow keys when ur in the wave to keep ur balance and so you can get more points which turns in MONEY!!!! PS keep movin the mouse up and down so u dont get suck in by the wave . (get more by going in survival mode)
when playimg hdryo hopper just hold down space bar so when u hit the water u get right back up in the air. if done good enough u can get to like 5,300 coins more or less. my highest was 5,380 coins on level 18 or higher i cant remember right now
now fishing and the puffle catching games give u double the coins. and keep a little fish on ur fishing rod when the big fish come so u can catch him
uh thank longhornz5 for this helpful tips i will use them immediantly or however you spell that idk im not an english genius
or am i??…………….