This Android app for the Illuminations online game Deep Sea Duel card game helps users develop mental computation skills by finding sums of 3 or 4 numbers. A student and the opponent, Okta the octopus take turns selecting cards. The first one to reach the target sum with 3 cards (in the 9-card game) or 4 cards (in the 16-card game) wins the game. You can choose how many cards are presented (9 or 16), what types of numbers they display (small integers through tricky decimals), and Okta's level of strategy. The game is not timed but depends on strategic planning in order to defend against Okta's moves while trying to collect a winning group of cards.


  • Mathematics > General
  • Education > General

Education Levels:

  • Grade 1
  • Grade 2
  • Grade 3
  • Grade 4
  • Grade 5
  • Grade 6
  • Grade 7
  • Grade 8
  • Grade 9
  • Grade 10
  • Grade 11
  • Grade 12


Grade 2,Grade 3,Grade 6,NSDL,Grade 4,Grade 5,Addition,Early Elementary,Express regularity,Reason quantitatively,Mathematics,Social Sciences,Arithmetic,Analyze and persevere,Process skills,Number and operations,Upper Elementary,Critical thinking,Subtraction,Life Science,Composition and decomposition of numbers,mobile app,Informal Education,Middle School,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Practice Standards,oai:nsdl.org:2200/20140728161017840T,Elementary School,Strategies,Chemistry,Decimals,Operations,Mental calculation,Problem solving,Education,Reasoning



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