Here are my minigame highscores rounded to the nearest 50.
(All 1 player exept sled racing.)

Astro Barrier	100 coins
Ballisic Biscuit	350 coins
Bean Counters	500 coins
Cart Surfer	500 coins
Ice fishing	200 coins
Puffle Roundup	50 coins (very ashamed)
Sled Racing	20 coins
Jetpack adventure	450 coins
Thin Ice	550 coins
Pizzatron 3000	600 coins
Catchin Waves	(so ashamed I won't say)

(The only reason I got 20 coins on sled racing is because it's the most you can get)