You would want to put those IF statements in a loop.
Like this:
WHILE TRUE 'Loops while the condition is true. TRUE is always true, so it loops forever.
B=BUTTON()
IF B AND #A THEN GOTO @GAME
IF B AND #B THEN GOTO @CONTINUE
IF B AND #X THEN GOTO @OPTIONS
WEND 'Ends the WHILE loop.
There are other ways of making loops; WHILE TRUE is just the way I prefer.