In Co-op, the whole class plays together against you, the teacher: you're the boss. The boss has HP, and every point a student scores is damage. The class wins if the boss reaches 0 HP before the game ends. Co-op works in all four live games and is part of Pro Teacher.
The boss's HP is set by the number of students in the lobby and fixed when you press Start. Students who join late add damage without making the boss stronger.
The results show whether the boss was beaten. There's no podium: the class won or lost together. The game's report includes a Boss Battle section.
Which boss should I pick?
Start with the Weak boss for a new video or a new class, and move up when they beat it easily. A fast class with strong powers can beat the Epic boss.
What if a student disconnects?