where reside the logic of the game

[pgdmovil]

I have very basic questions, the logic of the game must be in the mobil client or can reside in a server of SNAP or in a server of third parts.

[petrib]

Usually the actual game logic is on the device-side code (for speed, responsiveness + of course distributing the load).

I don't know how SNAP Mobile supports custom game servers, but you should be able to use TCP/IP sockets to talk to your own server to process data.