"Four tones" shows the same syllable in all tones — good for tone drills, but it reveals the base pinyin. The Not known test always uses similar words so the base isn't given away.
HSK standardWhich version of the HSK scale to use
Multi-select levelsSelect more than one HSK level at a time
Card sizeClick % to reset · or scroll over the grid
100%
Show pinyinToggle pronunciation guides under characters
Show numbersToggle rank numbers on each character tile
Keyboard shortcuts
Toggles
PShow / hide pinyin
VSwitch view — frequency / HSK level
SSwitch HSK standard — 3.0 / 2.0 (HSK view)
RTyped recall (hard mode) on / off
123Show / hide Learned · Learning · Not known
General
Ctrl+ZUndo last state change
?Open this panel
During a test
1–4Choose an option
EnterCheck / next
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EscClose test
On a character
Left-clickCycle state
Right-clickOpen flashcard
Filter characters
Paste characters separated by spaces or line breaks. Only those characters will be shown in the grid.