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.)
オO カKA ギGI クKU サSA シSI ジZI スSU ズZU ツTU テTE バBA ピPI
 フHU ベBE ホHO ボBO ポPO ミMI ワWA ヰWI ヲWO ヷVA ヸVI ヹVE
  O  KA  GI  KU  SA  SI  ZI  SU  ZU  TU  TE  BA  PI
HU  BE  HO  BO  PO  MI  WA  WI  WO  VA  VI  VE