https://lightbot.com/ https://lightbot.com/ There's apps for it now but it started as flash games which might be convenient - http://armorgames.com/play/2205/

https://lightbot.com/ https://lightbot.com/ There's apps for it now but it started as flash games which might be convenient - http://armorgames.com/play/2205/light-bot http://armorgames.com/play/2205/light-bot http://armorgames.com/play/6061/light-bot-20 http://armorgames.com/play/6061/light-bot-20