Cube School: Кубическая Школа

https://gd.games/kiwispace/cubeschool - Alternative link.

 You are an ordinary student who, due to carelessness, forgot his notebooks in different classrooms. Everyone has already left for home, and the school is empty. You need to quickly pack your things and leave, but you are not alone...

The teacher, who always seemed strict, turns out to be completely different from what people thought. He does not like when someone stays in the school, and now he is on the hunt. The corridors are getting darker, the doors are leading in the wrong direction, and the echoes of footsteps are getting closer...

Your goal is to collect the notebooks and get out before it's too late. But the teacher is always nearby, and if he finds you, you'll discover what lies beneath his familiar mask.

You thought this was just an ordinary school... but now it's your trap. Will you be able to escape?