No worries, happens to all of us. I'll try and have my CS up later today since right now I'm not at my actual computer.

Also, Cxyz (Chaos XYZ).are basically a more powerful form of a Number monster. They normally require a few high level monsters to summon, but it's super easy to summon them with Rank-Up cards if you have their regular form on the field. I personally recommend against them (since they can seriously be broken as hell) but as always that's up to you.