Dynamic lighting, In-game paint customizers, In-game brick makers(last 2 single player only), Dynamic physics(explosions that don't travel through walls), smooth particle effects, Sound dampening wall thickness(10 block thick wall will let more sound in than a 20 block thick wall), Updated game launching(so i dont wait 20 mins for it to sort out add-on errors.), Vehicle Physics(drifting at high speeds, loss of turning at high speed, tunnel vision at very high speed, flipping at ludicrous speed turns, explodes after 30 second being flipped..etc...).
highlight the impossible.