Every app blocker sells the same promise and differs only in the toll it charges. Some charge time: come back in twenty minutes. Some charge a password you gave a friend. One charges push-ups. We charge three questions.
That choice sounds like a gimmick until you look at what a toll actually has to do. It has to be slow enough to break the reflex, cheap enough that you don't uninstall the app by Thursday, and — the part almost everyone skips — it has to leave something behind.
Physical friction costs you the room
Ten push-ups to unlock a feed is a great demo and a bad daily habit. You can't do it on a train, in an office, in a waiting room, or in anything other than loose clothing. So the toll doesn't get paid — it gets bypassed. The blocker gets disabled “just for today,” and the honest version of that sentence is that the product asked for something the day couldn't give.
A question travels. It works standing up, sitting down, in public, at 6am, in a queue. A few minutes of thinking is a currency you always have on you.
A toll you get to keep
Time-based blocks give you nothing back. You wait, you win nothing, and the waiting quietly teaches you that the app is an obstacle rather than a choice. Resentment is a bad foundation for a habit you're supposed to keep for a year.
A question inverts that. You pay attention and you leave with something: the boiling point of nitrogen, who signed the Treaty of Westphalia, what a hash collision is. Twenty unlocks a day is a strange thing to be proud of. Sixty facts a day isn't.
Why a teacher, and why this one
We could have shipped a plain question card. We built a classroom and put Mr. Grummel in it instead, because the toll needs a character to be memorable and a little bit funny. He taps the board while you stall. He gets visibly annoyed after three wrong answers. He snaps his pointer if you really test him. None of that changes the mechanic — all of it changes whether you open the app again tomorrow.
Annoyance is the point. Not punishment — the difference matters. He's disappointed in the way a decent teacher is disappointed: briefly, and then he asks you another question.
What we're still unsure about
Cognitive tolls have a failure mode: if the questions are too easy they become taps, and if they're too hard you'll rage-quit into your phone settings. Difficulty is the whole product, and it's the thing we'll keep rewriting. The knowledge tree exists so that the next question is one step from where you actually are — not a random fact aimed at nobody.
If you have a subject you'd actually want to be quizzed on, hand in a request slip. He reads them.