Numenko-in-a-bag
 
Why are there more Multichoices and Freechoices than in the board game.
After playing many hundreds of games and constantly tweaking the rules it was found that this is the optimum range of tiles.
 
Can you change your sums in the middle of the game.
You can re-arrange your sums as often as you like during a game.   Just be careful you don't get caught with a handful of unplayed tiles.
 
Are there any variations to playing  the game
a. A player could play a solo hand. Same rules apply but you could set a time limit and try to beat your own best time, or add up all the answers to your sums and try to beat it.
b. If you are hosting the game you could declare that all answers to sums played must be at least in double figures, or single figures only.       
 
Can I change the rules.
If you own the game you can do what you like, so long as everyone playing knows the rules.   If you come up with any interesting ways of playing I would love to hear about it.
 
At the end of a game where there is no outright winner and the unused tiles are added up, why is the Freechoice worth 10.
Anyone who was daft enough to have an unused Freechoice in their hand and didn't notice that another player was almost out!   Well what can I say!
 
Board game
 
Why are the rules for the board game and the in-a-bag game different.
The board game is capable of being more complex and the in-a-bag game rules were changed slightly to make it,
a. More child friendly. 
b. Because there was no board it could double up as a travel version
 
Are there any variations to playing the game.
Instead of the highest score winning, you could try for the lowest score (NO minus answers!), not as easy as it sounds, or set a time limit per game/move or both.
 
Why are there not more Double score squares or even Triple score squares.
Getting the right combination of multiple score squares is important, and I am constantly trying new variations.