Hydra

All Versions of Hydra

• 
  3.1.3(21)This is the latest versionLatest

  XAPK

  Sep 8, 202622.9 MBWhat's New
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  What's new in the version 3.1.3

  Updated on Sep 8, 2026

  Version 3.1.3:
  
  • New module Implications: two statements, five answers, find the conclusion that follows necessarily. Difficulty adapts, with scoring, leaderboard and an error analysis that names the fallacy and shows it as a set diagram. Also available during the trial.
  

• 
  3.1.2(19)

  XAPK

  Aug 30, 202622.7 MBWhat's New
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  What's new in the version 3.1.2

  Updated on Aug 30, 2026

  Version 3.1.2:
  
  • New module Cube Folding: pick the cube view that folds from the net shown. Trains spatial reasoning, with scoring and error analysis.
  • New Community section: share questions, ideas and experiences, reply to posts, vote and mark solutions (for signed-in users).
  • Paper Folding: reworked figures for a cleaner presentation.
  

• 
  3.1(18)

  XAPK

  Aug 28, 202622.5 MBWhat's New
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  What's new in the version 3.1

  Updated on Aug 28, 2026

  Version 3.1:
  
  • Hydra now runs in your browser too: after the update, the app shows a one-time note about app.hydrapt.com. Same account, same progress, same leaderboard.
  • Anagram test: cleaned-up word lists, and the ß tile shows a single ß again instead of "SS".
  • Equation test: mathematically correct answers are now always counted as correct.
  

• 
  3.0.4(17)

  XAPK

  Aug 16, 202622.5 MBWhat's New
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  What's new in the version 3.0.4

  Updated on Aug 16, 2026

  Version 3.0.4:
  
  • Form Focus: the leaderboard now reliably recognises that results are based on the guessing-corrected scoring. Results from before the correction are no longer mixed in with new ones.
  • Your existing Form Focus results are kept and stay comparable.
  

• 
  3.0.3(16)

  XAPK

  Aug 13, 202622.5 MBWhat's New
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  What's new in the version 3.0.3

  Updated on Aug 13, 2026

  Version 3.0.3:
  
  • Matrices and Paper Folding: new point scoring. It counts how hard the solved items were, not just how many. Earlier results keep their percentages.
  • Form Focus: wrong answers are now subtracted, so guessing no longer scores. The pace adapts more reliably. Your previous Form Focus results are removed once in this update.
  • Training mode: the timer now runs correctly for the duration you pick.
  

• 
  3.0.1(14)

  XAPK

  Aug 4, 202622.5 MBWhat's New
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  What's new in the version 3.0.1

  Updated on Aug 4, 2026

  Version 3.0.1:
  
  • New module: Letter Cancellation, a concentration test with a mid-test rule switch
  • Paper Folding: fixed two tasks with ambiguous answer options, cleaner figure rendering
  • Onboarding polish
  • Minor improvements and copy fixes
  

• 
  3.0(13)

  XAPK

  Jul 30, 202622.4 MBWhat's New
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  What's new in the version 3.0

  Updated on Jul 30, 2026

  Version 3.0:
  
  • All-new UI
  • Sign in across your devices with Google
  • Bug fixes and improved stability
  

• 
  1.1.0(10)

  XAPK

  Jul 3, 202669.8 MBWhat's New
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  What's new in the version 1.1.0

  Updated on Jul 3, 2026

  New module: Form Focus Test
  
  - Adaptive concentration test inspired by the FAKT II. You classify stimuli (circle or square with 2 or 3 markers) as target or non-target. The pace adjusts automatically to your level.
  - Three metrics: concentration performance, accuracy, and homogeneity, plus a training mode with selectable duration.
  

• 
  1.0.7(8)

  XAPK

  May 17, 202669.8 MBWhat's New
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  What's new in the version 1.0.7

  Updated on May 17, 2026

  - Stroop test: colors are now clearly more readable in dark mode.
  

• 
  1.0.5(6)

  XAPK

  Apr 23, 202669.8 MBWhat's New
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  What's new in the version 1.0.5

  Updated on Apr 23, 2026

  New module d-Test: train selective attention and concentration under time pressure, inspired by the methodology of the d2-R. 14 lines with 56 characters each, 20 seconds per line. Mark every "d" with exactly two dashes and ignore every "p" and every "d" with a different dash count. Training mode with selectable line count. Concentration performance (KL) feeds the scoreboard and leaderboard.