This is a very basic Blooms editor, with nothing fancy like capturing rules. It just has the ability to play black/blue and red/yellow hexagons, by default of stack size 1. There are a couple of keys that will change this default listed below
Pressing the number key 1 will change it to a black hex.
Pressing the number key 2 will change it to blue hex.
Pressing the number key 3 will change it a red hex.
Pressing the number key 4 will change it a yellow hex.
Pressing the number key 0 will change it a yellow hex.
Pressing the shift key will allow you keep placing a hexagon of one colour, while pressing a second time will revert to normal move order.