To solve the problem of conventional game machines, which have a wait function for delaying the start of a succeeding game by a predetermined period of time, often resulting in the irritation of gamers because the more skilled they are, the more frequently the wait function is activated.

When a start lever 30 is operated before 4.1 seconds have elapsed after a preceding game to activate the wait function and turn ON a wait flag, a high winning probability AT lottery table is set in the game machine (Step 222). When the wait flag is not turned ON, a normal winning probability AT lottery table is set therein (Step 223). A random number lottery is employed with reference to either of the AT lottery tables set for an AT lottery to determine whether or not the AT game is performed (Step 224). When the execution of the AT game is won in the AT lottery, an AT flag is turned ON (Step 226) to be ready for executing the AT game.