Solitaire and all are present on Ubuntu. So yes.
Dota, Warcraft and the likes, no. If you insist, get Wine.
To dual boot, depends on what OS.
To dual boot Windows and Linux
1. Install Windows
2. During the partitioning hard disk, create at least 3 partitions.
Create more if you need them for backup purposes
3. Install Windows on the first partition and leave the other 2
blank
4. Insert the Linux CD, and follow installation guide
5. Install Linux on the next blank partition
6. 3rd partition is your swap. It's the Windows version of virtual
memory
7. Format these 2 partitions to install Linux
To dual boot Windows and Mac
1. Make sure Mac OS is installed first
2. Get Boot Camp and follow the instructions to install
Windows
To dual boot Mac and Linux
Not so sure, you have to ask the Mac guys.