It was a weird time. Around the time as the Famicom was just getting started, Hudson Soft struck a deal with Nintendo to release some of their games for the PC-88 Japanese personal computer platform.
Many of these games had weird differences from Nintendo’s originals. The best known of them is probably Super Mario Bros. Special, a very weird version with paged scrolling, which is to say, no scrolling at all, but just flipping forward one screen at a time. Super Mario Bros. Special isn’t on the subject page of this post, which is old enough that it’s only available on the Wayback Machine, but it is on the website World Of Stewart, and wonder of wonders that page is available on the living internet! Playthroughs of the whole game, in its clunky miscolored XOR-sprite glory, can also be seen on Youtube, here, for instance. (51 minutes)

There was also Punch Ball Mario Bros., which took the basic premise of Mario Bros. and just, well threw it away, just tossed it right in the trash, and replaced it with punching a ball around to attack enemies. Gameplay of that is also on Youtube. (5½ minutes)
Another version of Mario Bros., Mario Bros. Special (which isn’t Super Mario Bros. Special but something else) It’s harder to find Youtube video of that because Google assumes you must be looking for the Super version, but it can be found. (8½ minutes) If you recognize the title screen music from that then you are really a supergeek! (I did recognize it, so yes, that includes me.) And the game, wow… it really doesn’t look fun to play.
Some other games listed include Excitebike (11 minute video), Ice Climber (7½ minute video), the (only slightly Nintendo and with janky music) HAL Hole-In-One Golf (15 minute video), and (the very non-Nintendo) Chack’n Pop (4 minute video). Hole-In-One is a predecessor of Nintendo’s Golf, if you’re looking for that Nintendo connection.
One thing all of these games, except maybe Hole-In-One, have in common is they look like they’re excruciating to play now! They either have way too fast or slow controls, or ear-tearing scratchy music, or both. But they are interesting as curiosities, so here they are. Curious!
Strange and Wonderful NEC PC-8801 Games (Wayback Machine)