La clase interminable

It's the last day of school, a couple of hours and... finally vacation! But the day starts badly, Yerri falls asleep and the final work is not finished! He's only missing a couple of subjects, sure he can do something before... Oh, oh, what's that bright light? He's not in class anymore, he's on an active volcano! Yerri will be involved in a crazy contest where he will have to face zombie letters, an impossible circuit, a musical jungle... if he wants to turn in his work and pass the course. Run, Yerri, time is running out!