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A one-hit KO (abbreviated OHKO), also known as hit KO or hit kill is an attack property in Super Smash Flash 2 which, as the name suggests, can KO opponents in one hit even if their damage is 0%. As such, they are very powerful moves and most have to be charged. Self-destructs do not count as OHKOs. In order to acknowledge the attack was a OHKO, it has to share the following restrictions:
In Super Smash Flash, there are no OHKO attacks, as hitboxes have a constant, per-frame damage output rather than a single set value. However, instant-KO attacks are commonly erroneously referred to as OHKOs regardless.