That's our rule too!! So comforting to know. But yesterday when I asked him how he did he said he got a green, and after he finished playing he said he lied and really got a yellow. Stunned!!! Before I could even say anything he said it because he just had to play. It's something about the "worlds" in Mario that have him fascinated. He's opened up worlds 1-5 and I'm thinking once he clears 8 he will relax a bit.
OMG!! That would have really upset me. I think if that had happened at our house, the Wii would have been taken away for at least a week. Our DS5 has lied about the color he's received before, but luckily he has a sister in 1st grade, which is right across the hallway, so she's ALWAYS there to keep him in check...