Boo Destroyer posted...First of all, how are these determined?
Trophy (high score in solo attractions)
Discovery (...what the hell is this supposed to mean?)
Success (...and how many? 1?)
Participation (number of players?)
Stamps (how often does this happen? and most of those are damn difficult)
Every time you get a trophy (even if you have gotten that kind of trophy before) you get a couple of coins. I don't know how many coins you get for each kind of trophy but the better the trophy, the more coins you get.
Discovery was answered already. It is just how many coins you picked up while playing, like a coin from breaking a pot or finding one on the F-zero track.
Success...that one I don't know how it is determined. Maybe somebody else can help. I always assumed that if you beat a level in Zelda, Metorid, or Pikmin you got a success bonus for finishing the level.
Participation is always 1 for me but I have not played with other people in a few weeks so maybe you do get more if you if more players play with you.
Stamps is only if you got a stamp during that play session and each time you get a stamp it is worth 10 coins. Some stamps are hard to get but if you know the criteria for a stamp and want to try for it, wait until you see that event offering double coins. I typically check by hitting Y button in plaza and seeing if double coins symbol is on any of the events.
I don't know the best way to earn coins. Like you, I go play the ones offering double coins anytime they come up and after a round of that go back to working on my goal of getting gold stars on all attractions (dam Octopus Dance is my last hurdle). I want to say Pikmin has given me lots of coins but that might just be because I am working through the extra levels in that one.
---
<G>A Brother who always helps the widow's son; are you a traveling man too?<G>Addicted to
->Xenoblade