In the 90s I beat smw so hard, all the dragon coins, all the secret exits, tubular, the palette change, etc. it took years. I was convinced there was still more to find in that game even when the gba version came out and I finally had access to walkthroughs. I’m pretty sure I consulted Nintendo power on a few things though

I recently watched a guy play through the nes Bart vs the space mutants though and that was legitimately a like “no kid ever beat this”