Concentration Grid
Benchmark time for 3×14 grid: 1:06
http://www.concentrationgrid.com
http://www.facebook.com/ConcentrationGrid
http://www.twitter.com/ConcentrationGr
#ConcentrationGrid
Sent from my iPad Pro
Concentration Grid
Benchmark time for 3×14 grid: 1:06
http://www.concentrationgrid.com
http://www.facebook.com/ConcentrationGrid
http://www.twitter.com/ConcentrationGr
#ConcentrationGrid
Sent from my iPad Pro