U-Genix

Mine is personally Glimpse Of Stocking from TSFP. Fun little speed run stage, which isin't too annoying to try to speedrun since it's not difficult.

I don't know the english name of the challenges, but you have to toss a monkey on siberia to play curling. "Monkey curling"? I love that one

I remember when I couldn't get Gold from that - not even silver. Then one day I tried it because I was very bored and I instantly got platinum.

I think the first time I did this challenge I didn't got anything near Gold. But it doesn't take much practices to get better results on this arcade mission. Just aim for some lower speed and near the middle and you are almost set.