I only played/saw this game ONCE in my life, and it was when I was still quite young, probably six or seven. I was at a cousin's house, and there was some game on the TV I'd never seen before, and I suspect that it was on a console I'd never heard of at the time [footnote]Either the Master System or, probably more likely, the Turbo Grafix 16, but I don't remember seeing the console, so I don't know which.[/footnote] The big thing I remember about the game was that you climb up waterfalls while avoiding falling boulders. It was a side-scroller, by the way.
Now, I suspect based on what I remember of the character design that it might have been one of the Bonk games, but as I've never had a chance to play a classic Bonk game (I'd never heard of the Turbo Grafix 16 until well into the 2000s), I can't be sure.
...I'm also going to give an honorary mention to a game I'd played at a different cousin's house (I have a lot of cousins and second-cousins and cousins-who-aren't-blood-related-but-very-close-family-friends). I should mention that I was about eight or nine, at this point. This game was some kind of point and click adventure game involving some guy and his motorcycle. I remember one time starting the game and the narrator talking about "my bike", and then punching out of a dumpster. Later, I'd start the game and it would be night with the bike broken. My cousin told me that the goal was to collect parts because the lady working on the bike (who's, apparently, "got a wrench") doesn't have everything she needs. Those parts were scattered around a junkyard guarded by a mean bulldog who had to be distracted with meat. Once the parts were collected however, there was some part that you had to be fast with your fingers, because after entering the command, the keys of the keyboard would jump out at you fast, and if you weren't fast enough, you could lose a finger or two. (My cousin showed me his pinky, and even though there didn't seem to be anything wrong with it, he insisted that it was fake. ...) I give this one an honorary mention because, after some periodic searching to find the game again, I learned just last year that it was called Full Throttle, and I've been meaning to play it through at some point. To this day, I'm not sure what motivated my cousin to tell the whole finger-destroying keyboard story, and I don't actually know if I ever saw him again... or, come to think of it, if he really was a cousin and not just the then-teenage son of a friend of my dad's. Could very well have been the whole "kids'll believe anything you tell them because they're stupid" nonsense that a lot of people get some impish joy out of. Sad thing is, I actually was, and to some degree still am, quite gullible, so I actually DID believe him at the time. DX