Eliminate all electrons and positrons from the board!
How to play
Each time you click or tap on a particle, it clones itself. Positrons go right and top, electrons left and bottom. Two identical particles cannot coexist in the same cell, so if this would occur, the particle will not clone itself. And if two opposite particles meet, they cancel each other.
By now this is an experimental puzzle; the challenge is to achieve the free board with the less steps possible. ¿Do you know the minimum?