'ShowHand' Game Rules Unknown: Provide Details on Type, Components & Origin for Help

"ShowHand" is not a recognized game in major databases (BoardGameGeek, Wikipedia, Ludii, Pagat). It may be:

• Regional/Folk Game: Passed down locally, undocumented online.
• Alternate Name: Showdown (poker variant), Show Hand (bridge term), Cheat / I Doubt It (bluffing), Liar's Dice.
• Custom / Homebrew: Created by friend/family/class.
• Digital Mini-Game: Inside a larger title (Mario Party, Jackbox, etc.).
• Typo: Showdown, Shogun, Shobu, Schotten Totten.

To Identify It

Share:

1. Components: Cards (standard? special?), dice, board, tokens, app?
2. Players: 2? 3–6? Teams?
3. Goal: Empty hand? Capture cards? Score points? Bluff?
4. Core Mechanic: Play matching? Declare higher? Reveal simultaneously?
5. Origin: Where/when did you learn it?

With details, I can match it to known games or reconstruct rules.