I like Hactar for a simple AI opponent: https://play.google.com/store/apps/details?id=net.gowrite.hactarLite&hl=en https://play.google.com/store/apps/details?id

I like Hactar for a simple AI opponent: https://play.google.com/store/apps/details?id=net.gowrite.hactarLite&hl=en https://play.google.com/store/apps/details?id=net.gowrite.ha... For general use as well as GNU Go and DGS: https://play.google.com/store/apps/details?id=mco.prj.app.bwgofree&hl=en https://play.google.com/store/apps/details?id=mco.prj.app.bw... For Go problems, Tsumego Pro: https://play.google.com/store/apps/details?id=net.lrstudios.android.tsumego_workshop&hl=en https://play.google.com/store/apps/details?id=net.lrstudios....