Matthew Downing

Matthew Downing

Building practical learning tools

Badges

Tastemaker
Tastemaker
Gone streaking
Gone streaking

Maker History

  • Manipulation — The Card Game
    Manipulation — The Card GameBuild melds, reshape the table, outplay everyone
    Jul 2026
  • RiverLab
    RiverLabPractice poker pot odds with exact, transparent math
    Jul 2026
  • 🎉
    Joined Product HuntJuly 18th, 2026

Forums

Manipulation — The Card Game - Build melds, reshape the table, outplay everyone

Manipulation is a free browser card game for 2–8 players using two decks. Build sets or same-suit runs of three or more, then reshape the shared table by moving cards between melds—so long as every pile remains valid. Play timed or untimed, across devices with a room code, against bots, or control several seats yourself. Four rotating rounds and a golf-style scorecard reward the lowest score. No download or ChatGPT sign-in required.

RiverLab - Practice poker pot odds with exact, transparent math

RiverLab is a free, no-login poker education tool for practicing turn call/fold decisions. It combines an exact clean-outs calculator with 12 reviewed drills that show hit probability, required equity, and direct-showdown call EV. Progress stays on the learner’s device. It is deliberately narrow—not a solver, not GTO advice, and not a promise of winning.
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