The core course keeps its system small on purpose: no reading, hours without minutes, five counters, prices you point at. Every one of those is a real piece of Japanese the course skips because the traveler’s cost/benefit didn’t justify it. Skills are how you buy one back. Each skill extends the system in exactly one direction — a script, a number system, the clock — as a self-contained module with the same format as everything else: audio on every item, tap-to-reveal, and an Anki deck.
Two promises hold for every skill:
- The core is sufficient without it. No skill is a prerequisite for anything; a skill exists for learners who want the ability, not because the course secretly needs it.
- Skills extend, boosters don’t. Boosters add vocabulary to frames you own and never touch the system. A skill is the one kind of module allowed to teach something structural — and each one names exactly what it adds.
Shipped skills are listed below; more are planned (number fluency and prices at speed, clock time with minutes, the calendar).