Teeworlds https://teeworlds.com and its mod ddnet https://ddnet.tw

I've been playing for a full on decade, the game was your typical third person shooter but around 2015 a mod came out that allowed fast completion of puzzle like maps, then it diverged and it now has two versions. Everyone mostly sticks to its ddnet counterpart. but the quake style, deathmatch/ctf/team is still fun at times. though nobody plays it.