Dominoes
Block dominoes as it is actually played: seven tiles each, no boneyard, the forced double-six pose, knocking, and a blocked hand scored on what is left. Partners, cut-throat or first to 100.
Trump Call
Thirteen cards each in partnerships, with trump made by the first player who cannot follow suit. Walking, undertrumping, and an immediate finish at seven tricks.
Three Call
Three cards each, draw from the stock or take the pile, and lock when you think your hand will hold. Everyone else gets one more turn.
Ludo
The full rules, not a simplified version: a six to leave the yard, starred safe squares, two-pawn blockades, captures, an extra roll, and exact entry home.
Every table has a rules button, and every rule is the real one.