of course, being well-tuned to the needs of the younger generation I have prepared some tools that should allow them to, if not stay off our lawn then at least be quiet while trampling it. i don't have an android phone, but those should run on it, i think:
http://mirtchovski.com/code/code_files/sokoban.tgz http://mirtchovski.com/code/code_files/decay.b http://mirtchovski.com/code/code_files/lens.b http://mirtchovski.com/code/code_files/zoom.b http://mirtchovski.com/code/code_files/rotzoom.b
