Make your red cell colony survive the blue cell colony.

You play as Red against the computer, which plays Blue.
Click the board to let the sytsem drop a few black walls and green 'food' positions.
Then you alternate with the machine dropping three small cells, three medium sized cells and three large cells.
After that the game runs by itself until one of the cell colonies has died out.

A new green food position is created after four cells have moved.
Small and medium sized cells grow in size when they eat the green food (step onto a green position).
When a large cell eats food, it will give birth to a small new cell.
Cells do not eat each other. A cell cannot move to position occupied by another cell.
Cells move orthogonally, usually at random, but they will always eat the food if they are next to a green position.

Cells have a limited lifespan, counted in 'ticks'.
A new small cell has 7 ticks, a new medium cell 14 ticks, and a new large cell 21 ticks.
A cell ages one tick with each move (except when eating food).
Additionally, every time ten cells have moved, EVERY cell on the board is aged by one tick.
A large cell with 15 ticks will turn into a medium cell with 14 ticks when aging.
A medium cell with 8 ticks will turn into a small cell with 7 ticks when aging.
A small cell with 1 tick will be eliminated during the aging process.

A cell remembers the direction of its last move, and it will usually not go backwards; the only exception is when there is food to be eaten. This greatly enhances its survival rate.

The game stops when (and if) all cells of one colour have died.
Experiment!
You can vary the amount and layout of the walls to see whether the cells can find the food.
(Remember you can use CTRL-C plus mouse click and CTRL-V plus mouse click to edit the board).

Variant 1: Human against machine. Blue has some basic understanding of where to place its nine cells at the start of the game.
Variant 2: Human against human. Here the blue player faces no restrictions.