 CEREBRUM
 
How to play

You will see two grids. One of the grids is already filled with numbers between 1 and
4. The other grid is empty. The idea behind the game is to form an image of
the second grid by clicking on squares in the empty grid. There are only a
couple of simple rules to follow:

You may only click once in each square ( ie. the square has to be empty ), and
doing this will place a 1 in this square. If it has any non-empty
neighbours, they will all be incremented by 1, with wraparound after 4 ie. if
number > 4 --> number becomes 1.

You can see bonus timer in lower right hand corner of screen. 
The faster you solve each puzzle, the higher your bonus points.

Game is saved when you leave ( quit ) so it is possible to continue an old
game or to start a new one. Game ends only when you choose to do that.
There is no penalty for using undo or skip.  

Controls  

 Menu / Options: 
 
 2-up 
 8-down 
 5-select / change option 
 0-exit / back
 
 Game:
 
 2-up
 8-down
 4-left 
 6-right 
 5-select 
 *-undo
 #-skip
 0-back 

 Note: you can configure custom keys from Options

Touchscreen 

 Menu/Options:
  
 You can select or change option by clicking it. 
 click X to exit.

 Game:
 
 click to select.
 click undo or skip button to use undo or skip.
 click X to exit.
 
Note: 'X' is in upper right hand corner of screen.    