Game Escape From Cheerful Classroom online

You have left after school, but the teacher apparently forgot and did not appear, and the cleaner quickly locked the door to the classroom. You are trapped, and if you do not want to stay in school at night, think of a way out. You can help savvy and all that you will find in the classroom, and even a rare opportunity to look into the locked cabinets, drawers and boxes are not available before, but will have to unravel the code.