Laser

Laser is One of Kirby's Copy abilities.

Kirby gains a high-tech visor capable of light amplification by stimulated emission of radiation, which he can use to fire at enemies and ricochet off slopes.

Kirby's Adventure and Kirby: Nightmare in Dream Land
Kirby does not gain a hat after copying laser, but will fire them from his hands. On it's own, laser is a pretty basic attack, but it's also capable of ricocheting off of slopes and that particular tactic is utilized in several of the game's many puzzles. It's exatly the same in Nightmare in Dream Land, only the ability gets it's hat.

Kirby & the Amazing Mirror
No differences in this version.

Kirby Squeak Squad
At first, Kirby attacks with laser the same as in his previous adventures. However, after he acquires the Copy Scroll, he obtains the ability to charge the laser for a few seconds, and fire off a larger beam, which also increases its strength.