Is there a way to show collision in-game?

I’d like a way to make my collision boxes become visible in the game mode so I can test and find problems easier.

Use wireframe gizmos, then toggle so that they are visible in the game view

for example :

#pragma strict


function OnDrawGizmos()
	Gizmos.color = Color.yellow;
	var col : BoxCollider = GetComponent.< BoxCollider >();
	if ( col )
		Gizmos.matrix = transform.localToWorldMatrix;
		Gizmos.DrawWireCube( +, col.size );

Not exactly - however, view your game in the scene view while playing - have both scene and game views visible and you will be able to visualise everything.