Cover a photo with numbered masks, guard each one with a question, and share one link. Students answer together to reveal the picture, piece by piece.

Three steps, no lesson-planning software required.
A map, a historical figure, a diagram, anything tied to the lesson.

Vocabulary, dates, a calculation, whatever the class needs to recall.

No login for students. They answer together to lift each mask.

Students just open the link. Nothing to install, nothing to sign up for.
Faster to set up than a slide deck, reusable across classes.
The picture is the reward, so students push through the answer.
Project it, or let students follow along on their own device.
Two guides written for the classroom: five ready-to-use warm-up formats, and a five-minute vocabulary quiz walkthrough.
Free to play, free to create, no software to install.