This was my absolute favorite cross-ice game to play at practice as a college hockey player and I've used it with every team I've coached for the past 20 years to help players develop heads-up scanning and awareness of where open ice is. I particularly like using the 2v2 and 3v3 versions during tryouts and player evaluations to see which players can find and use the open ice effectively as the puck carrier and support player(s). 

Goalies Have No Friends Game:

Drill Description:

The coach dumps a puck in for players to play 1v1, 2v2 or 3v3 where anyone can score on any net at any time. The coach throws in a new puck if a goal is scored, puck is saved or puck leaves the zone.

Play 30-40 second shifts at full speed and change on whistle or change on fly.

Variations:

Add the condition that players must make a pass to their teammate before scoring off a change of possession

Try it out at your next practice to see which players already understand where to find open ice and continue using it as a way to teach/promote finding open space.