The Stun Gas Bloon can exploit Monkeys with multiple ammo, especially those who are defenders or attack multiple targets.
Note that it has no practical effect against Mortar Monkeys or other Mortar cards, since they recover from being Stunned immediately when the turn ends.
The Stun Gas Bloon does not stop Monkeys from reloading, so damaging it with the last shot of a monkey has no practical effect on the Monkey, unless said Monkey has an end-of-turn effect. Likewise, Heroes cannot be stunned by damaging it.
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