Portals can be useful.

Portal was published in 2007 and the second part Portal 2 in 2011. Both games are highly praised by Gamers and Media. Portal was even one of the games chosen from the Museum of Modern Art in 2013 for a long time design exhibition. I had just a short session Portal 2, but enough to give them a good use. ( ͡° ͜ʖ ͡°)