head to head
Hidden in Plain Sight asks more than Agar.io, and the gap is reads.

Reads · Competitive PvP
A browser arena where your cell eats smaller players and flees bigger ones.

Reads · Pure Mind Games
A couch party game where players imitate AI characters and try to spot which sprites are human.
Agar.io leans Reads (Competitive PvP); Hidden in Plain Sight leans Reads (Pure Mind Games).
Agar.io leans a little harder on execution, though the gap is small.
Agar.io
Mouse steering and split timing
Hidden in Plain Sight
Simple inputs; a steady trigger finger helps slightly.
Hidden in Plain Sight leans clearly harder on reads.
Agar.io
Baiting and predicting human blobs decides fights
Hidden in Plain Sight
Acting like an NPC against watching humans is the entire game.
Hidden in Plain Sight leans a little harder on variance, though the gap is small.
Agar.io
Spawn locations and lobby makeup random
Hidden in Plain Sight
NPC crowds and random objectives provide cover noise.
Agar.io leans a little harder on optimization, though the gap is small.
Agar.io
Split-merge math is shallow but real
Hidden in Plain Sight
Minimal systems; little to optimize beyond NPC mimicry.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.