Lasers

Lasers are a type of blocker in Smash Hit which are introduced in the last section of Checkpoint 3. They can only be destroyed by smashing the glass at the end of them, as throwing balls at the laser beams is ineffective - the balls will break in a flash of light.

When you first encounter lasers, there will be an arrow pointing at the glass, they will not appear after that, just in Checkpoint 3, but they appear in some other checkpoints. Here are the checkpoints they appear on.
 * Checkpoint 3 (Stage 4)
 * Checkpoint 6 (Stage 2 Part 1)
 * Checkpoint 10 (Stage 1 and 2)
 * Checkpoint 11 (Stage 1)
 * Endless mode (1st stage and Variations)
 * Zen Mode (2nd stage and variations)

Most lasers have an arch of some sort. The arch usually has a sort of "coating" that protects the laser from damaging the stone.
 * Local Multiplayer  (Stage 2, 3 and 7 Variations in Co-Op mode

Type-1
These only appear in Zen Mode, and only have one beam.

Type-S (small-size)
These lasers appear in Checkpoint 3, Checkpoint 11 and Local Multiplayer. They have three beams.

S-S
The stationary-type small lasers appear in Checkpoint 10 and Local Multiplayer, and are blocked by crystals (Transformational in Checkpoint 10, Pyramidal in Local Multiplayer).

S-M
These ones move, and appear in Checkpoint 3 and Checkpoint 11.

In Checkpoint 3, the moving lasers can be dodged.

Type-M (medium-size)
These lasers have four or five beams, and are the most common type. They appear in Checkpoint 6, 10, Endless.

Type-L (large)
These lasers are exclusive to Checkpoint 3. They have ten beams. They can be divided into two types:

L-S
These lasers are blocked by the stone walls. They are shorter by quite a large degree than L-L.

L-L
These can often be blocked by Falling Glass Planks. You can, however, still crash into the planks or the laser. Their long length is required for the planks not to hit the walls when falling.

Trivia

 * Explosive Balls are good at smashing the lasers, even from far away (explosive balls spread the force from the stone).
 * Most lasers have pink glass, however in Local Multiplayer they have black glass.
 * When balls break, they explode in a flash of light, much like how Power Ups are collected.
 * The ball-breaking-on-laser sound is shared with the shooters in PinOut! (FANDOM here).
 * When the laser glass breaks, there is a brief puff of smoke.
 * Strangely, the laser glass will disappear right into the laser arch frame, and even the stone walls or floor.
 * Sometimes it's also seen hanging from the stone, after it's been smashed - see the GIF.
 * The frame appears to have a type of coating, preventing damage to the stone (with the exception of Type-1 in Zen Mode, and type-M-M of Checkpoint 10).