head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

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

Reads · Pure Mind Games
A one-versus-one hide-and-scare game about outpredicting an invisible human opponent.
Agar.io leans Reads (Competitive PvP); Hide and Shriek 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
Hide and Shriek
Movement and clicking traps need little dexterity
Hide and Shriek leans a little harder on reads, though the gap is small.
Agar.io
Baiting and predicting human blobs decides fights
Hide and Shriek
Outpsyching another invisible human player is the core
Hide and Shriek leans a little harder on variance, though the gap is small.
Agar.io
Spawn locations and lobby makeup random
Hide and Shriek
Hidden opponent position adds investigative uncertainty
Hide and Shriek leans a little harder on optimization, though the gap is small.
Agar.io
Split-merge math is shallow but real
Hide and Shriek
Trap and spell choices reward tactical planning
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.