Semi-spike

Semi-spikes are attacks in the ' series and in the ' series that send opponents at a very horizontal trajectory, which, due to the foes' gravity, can end up sending them slightly downwards. This is what makes it different from meteor smashes and spikes, which directly send opponents downward.

In Super Smash Flash
In Super Smash Flash, all moves are semi-spikes, although the moves coded to have vertical knockback — every character's up attack and — will not semi-spike if the victim's horizontal speed is not high enough at the time of the hit.

In Super Smash Flash 2
In Super Smash Flash 2, the physics were changed to be closer to the official Smash games, causing moves to have different knockback tragetories, and thus, only specific moves can semi-spike opponents.