head to head
Worms 3D asks more than Agar.io, and the gap is optimization.

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

Execution · Competitive PvP
Artillery touch, human prediction and weapon economy in destructible 3D terrain.
Agar.io leans Reads (Competitive PvP); Worms 3D leans Execution (Competitive PvP).
Worms 3D leans a little harder on execution, though the gap is small.
Agar.io
Mouse steering and split timing
Worms 3D
Judging grenade arcs and wind in 3D takes real touch
Agar.io leans a little harder on reads, though the gap is small.
Agar.io
Baiting and predicting human blobs decides fights
Worms 3D
Predicting where a human hides and strikes next matters
Worms 3D leans a little harder on variance, though the gap is small.
Agar.io
Spawn locations and lobby makeup random
Worms 3D
Wind, crate drops and terrain chaos swing turns
Worms 3D leans clearly harder on optimization.
Agar.io
Split-merge math is shallow but real
Worms 3D
Weapon economy and positioning math reward 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.