The teacher earns trap uses as the students make mischief: one use at 25%, 50% and 75% of the mischief target at default rules. The room rule Trick Progress for Mechanisms moves the first point, and the second and third come at two and three times it; points above 100% are dropped. Uses stack, and all of them reset when the class ends. With the room rule Enable Traps set to No the teacher gets no uses.

Once switched on with Enable it works for the rest of the class, checking every 0.5 seconds. It raises the alarm when it sees a player student holding a trick item in hand (the book and pen do not count), chewing bubble gum with no balloon ready, or playing a computer game. Every classroom has 2 cameras; the Dormitory has 4.

The teacher switches it on with Enable from up to 2.5 m away. For the rest of the class the teacher sees an arrow towards every mischief sound, each kept for 1 second. Each teacher can switch on one radio.