More than 20 pinball machines have been  set up at the Olive Tree pub in Cwmbran, Gwent.
Other arcade and console games will also be available to play at the event, on Saturday and Sunday.
Organiser Dave Wilcox told BBC Radio Wales competitors will have the chance to win themselves a position on the World Pinball Championship table.
About 100 retro gaming enthusiasts are expected to gather in south Wales to compete in the Welsh Pinball Cup.