Yogi Bear's Gold Rush is done:
Fairly easy game, except that you have to get 12 hidden items to get a good ending, with no recourse if you miss one (except to restart your game). Most aren't too tough to find, but a couple require blind leaps of faith, and the last one expects you to walk through a wall of spikes, with absolutely no cues to suggest the idea. Plus there are more than 12 levels in the game, and you have no way of anticipating which ones will have the hidden items.
I caved and looked at a walkthrough for several of them, which is a shame since it'd be more rewarding to find them on my own (as I did for the majority), but investing an hour only to get scammed in the final area isn't my idea of fun.
BTW there's a trivial 1UP loop in the third part of the first area -- you can collect two 1UPs and just commit suicide, or power through and collect a total of 4 since they respawn after you go to the bonus room.
I usually try to play on hardest settings but, after playing with "attempts" and "retrys" [sic] cranked up to maximum, I'm not planning to bother with a replay since I 1cc'ed the game and, though I finished with only 1 life remaining, could easily have accumulated 20 more.