Compiled past lists of suggestions in the past. (Mini games ideas, Mini-Game Idea Thread, more ideas)

LUCK/CHANCE-BASED
-Higher/Lower
-Rock Paper Scissor
-Hide-and-seek (can incorporate Hatchlings)
-Treasure Hunt (3 agree)
-Spin-the-Wheel, once a day
-Mazes (though w/ the new zones, I think we have enough mazes)

THINKING-BASED
-Card Games
(ie Blackjack, Solitaire (1agree))
-Memory Games (ie matching) (3 agree)
-Minesweeper
-Sudoku
-Tic-tac-toe
-Simon Says
-Jigsaw Puzzles (with ingame images) (1 agrees)
-Hangman

Popular Board Games:
-Yahtzee
-Battleship
-Connect 4/GO
-Majong

Popular Flash Games:
-Snake (several ~3 agree)
-Tetris (2 agree)
-Bubble Popper
-Bejeweled
-Shooter/side scroller game w/ Aurleon shooter
-Castle Defense

THINGS IN DEVELOPMENT
-Farming/Mining (goes along w/ crafting)
-Housing fun

Awesome!