Type pinyin with tone numbers — ma3 becomes mǎ. Tones 1–4, 5 for the neutral tone, v for ü. Drill stops you on every mistake until you fix it; Test never interrupts — you get the full report at the end.
One per line: 汉字 zhong1guo2 — tones 1–5, v for ü. Load it, then copy the page URL to share with a student.