Jonathan Blow, lead designer on The Witness

Screenshot from Jonathan Blow's Reboot Develop 2017 talk.

"This is a work-in-progress," Blow explained. "These are not final visuals, but it's a nice little grid-based game. I've got a guy who can run around and push blocks and stuff."The demo — meant to show off the engine Blow has been building for the past year — showed off a single level from the unannounced project, which Blow described as "not remotely final."According to Blow, he's already designed about 25 hours worth of gameplay for it. You can watch the full stream of Blow's Reboot Develop 2017 talk on Twitch . The demo begins at the 5:32:46 mark.

Chloi Rad is an Associate Editor for IGN. Follow her on Twitter at @_chloi