Creating a new game can be fairly easy if you start with an idea from an existing game and expand on it. And you can often create a game using common game equipment.dnd dice
There is a dice game called Shut the Box that uses a pair of dice, and box with a row of twelve hinged tiles containing the numbers from 1 to 12. Each tile can either be standing or lying down.
When a group of people play the game, each plays a solitaire game. At the beginning of each player’s game, the lying tiles are raised so that they are all standing.
During your game, you roll the two dice into the box, and try to lay down standing tiles that total the number rolled. If your first roll is a 7, you can lay down the 7, or the 6 and 1, or the 5 and 2, or the 4 and 3, or the 4 and 2 and 1. You continue rolling the dice and laying down tiles until you are unable to find standing tiles that match the number rolled. Then you add up the numbers on the tiles left standing, and record this as your score.
The tiles are then raised, and the next player starts. When all players have played, the player with the lowest score wins.
Now create a new game based on the idea of matching dice rolls to numbers. Substitute a deck of playing cards for the tiles and the box. One suit of cards gives you your 12 numbers plus a King. Without the King, you could play Shut the Box.
You decide to change the game from a series of solitaire games to a game in which the players take turns playing, beginning with a starting player and moving clockwise around a circle. To give each player a more equal chance of scoring (remember the 4 and 2 and 1), each player tries to match the count on two dice to the number on one card. To increase the chance of scoring, you add a third die.