Covering the game, or living in it

Most ads in games still take over the screen. There is another way to do it.

OverlayIn-world
Where it showsOn top of the gameOn a surface inside the scene
What the player doesWaits or closes itKeeps playing
How it is drawnAs a separate layerBy the game engine, like any object

Gadsme only does the second kind: no overlays and no interstitials. More at gadsme.com.