As you already noticed unity provides many of these components in 2 versions for instance box collider 2d and box collider well the difference is the second one is for 3d.
Unity 2d floor.
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Elevate your workflow with the floor materials pack v 1 asset from vk gamedev.
This would lead to the player getting stuck inside the floor when landing a from a high jump.
Browse more 2d textures materials on the unity asset store.
Elevate your workflow with the tile floor asset from casual2d.
Recently i have been working on a 2d platformer which uses the inbuilt unity physics and rigidbodies.
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Browse more 2d textures materials on the unity asset store.
2d is not 3d.
One of the challenges i ran into was that when the player moved above a certain velocity it would sometimes pass through colliders.