How do make a gap in a block where a player can go trough it.

Hi, my name is R0CK

I am making a game known as gun rush. I am trying to make a gap where the player can go through but there is no feature, where you can design your own collision.

i’m not sure what you mean. also, can you also have a game link?

You can make your own hitboxes in a weird kind of way.
Make the shape you want and just animate over it.

Custom Hitbox: