You are playing volleyball at the beach with your "blob", each player controls one. Its very easy to learn and it makes realy a lot of fun. Its the perfect lan game for short time fun in the office, it also can be played in a window. In Europe its so famous thats nealy on every big lan-party event there is also a Blobby-Volley Challange ;) (only 1 MB)
A 3d table-tennis simulation that can be played easy in a single window. Certainly you have to exercise a bit for understanding the controlling, but if you have understand this, playing that games in lan makes really fun. Its absolutely recommended for the office and lesser that 10MB.
