Click Japanese Katakana in sequence. If you missed a symbol, then blink would stop responding.
(Know or already memorized symbols? Then try the phonetic order.)
カKA ガGA ギGI ゴGO ザZA シSI ジZI スSU ズZU セSE ソSO ヂDI ヅDU
 ドDO ニNI ノNO ピPI プPU ペPE ポPO ミMI モMO ヤYA ラRA ヰWI
  KA  GA  GI  GO  ZA  SI  ZI  SU  ZU  SE  SO  DI  DU
DO  NI  NO  PI  PU  PE  PO  MI  MO  YA  RA  WI