There's probably only one game I well and truly mastered, and at the time I didn't even realise it.
My mate and I used to play Whacky Wheels loads. It was one of the few games that my first PC came bundled with. (I wasn't about to play XCOM or DOOM, aged 8. Sensible Soccer was played a lot too).
I remember we'd be "playing out" for a bit and after a while, everyday and right on cue, he'd ask if we could go in mine and play Whacky Wheels. It got to a point where I'd go in to "ask my mum" and beg her to say no, and she'd say if I didn't want to play it today just tell my friend that. I never had the nerve to, so everyday we played Whacky Wheels. It was actually a fun game, like Mario Kart but with animals and different weapons and power ups. Anyway, we played it a lot.
When I was about 10 my neighbour used to always be off school sick whenever I was, it was weird but a regular thing. She was about three years older so our parents figured we'd be safe if we stayed off together. We played a few games - mostly Amiga ones like some Indiana Jones game in Venice (Last Crusade, I guess?) and another one where you're a surgeon. I wanna say Surgeon Master but I'm definitely mixing it up with another game we loved, Stable Masters. I'd played the surgeon game on my own and never got anywhere but she'd seen her brother Kev play it so within minutes we were in surgery. It was awesome!
Anyway, we played Whacky Wheels a lot. And I mean A LOT. More than me and my mate did. We'd spend a whole day playing it, taking it in turns. It was fun, but the Amiga games were probably more enjoyable. She liked SWOS thanks to Kev, so we played that a lot.
Anyway, about ten years later me, my brother and the mate from the start of this post dug out the old PC and booted up Whacky Wheels for old times sake. All the records where still on there from when we played it, and from when me and Kelcie played it.
Our lap times were INSANE!!! Like 12 and 13 second laps, whereas now we were struggling to do them under 40. It made no sense. How where we that good?! She was even better than me! So yeah it's safe to say I mastered Whacky Wheels.