Memory Riddles_Inside the computer gaVersion en ligne Find the answer to the riddles. par Larraitz Berraondo Alberdi Sometimes it is green or yellow. Sometimes it is red. What is it? You can't see it. You can't touch it. You can't smell it but you can feel it. What cat you open but never close? You see me during the day but not at night. What am I? Which type of dog has no tail? I open your house but I'm not a robber. What am I?