Passengers complained to bosses at Blackburn Transport in Lancashire when they heard the sound effects of the game coming from the driver's cab.
The firm reviewed CCTV footage after it was claimed the driver was using a Play Station Portable (PSP) when he should have been watching the road.
Lancashire Police said it would investigate to see whether a criminal offence had been committed.
'Dim view'
Blackburn Transport managing director Michael Morton said: "We have taken the appropriate disciplinary action.
"If someone was using a PSP while driving, they are not watching the road ahead.
"We take a very dim view of the use of any portable device while driving a bus."
A Lancashire Police spokeswoman said officers would review CCTV footage from the bus.
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