Splinter Cell!
It took stealth to a whole new level that we hadn’t seen before at that time. Back then the only main concern was whether an enemy could see you or not in their vision. But SC took way more things into consideration like light level, thermal, sound etc.
It was a more gritty and hardcore version of stealth. But for some reason there hasn’t been a release in years For whatever reason. There wasn’t a bad game that killed the franchise they just kinda stopped.
How about you? Are there any franchises you love but the devs don’t share the same interest as you?
Portal