Breakable Glass blocks off an area until it's smashed.
Mask a wall and texture it with breakable glass (#503). Use
T to make the glass transparent. Press
H on it (or
Ctrl + H in 2D mode) to make it blocked and hittable.
- Breakable glass without blocking/hitscan flags enabled can still be shattered by a nearby explosion. If you don't want to use other glass textures, and want to make this specific texture unbreakable, apply the texture to sprites instead.
- Breakable glass walls with one-sided masking (
Shift + M) and blocking/hitscan flags enabled can be shot from the invisible side, leaving bullet holes in mid-air. If you then shatter the glass from the proper side, the bullet holes will remain.