multiplayer addition online game needs modifying

I have a multiplayer addition webapp linked to membership mysql db. Any member logged in can play alone or with [login to view URL] Addition operations will be visible to all users. Currently it has only one level active. ***I want all levels to be active so that a member can press a button to choose a level and play. It should allow 5X10=50 games . on completion, certificate should be made available. *** it has a few drawbacks, when a game finishes, one cannot play again until a few button clicks are made. These button clicks are necessary to bring new math operations. Otherwise, same old operations will be presented. This game has level 1 “addition” with two random numbers $value1 = rand(2, 50); $value2 = rand(2, 10); in [login to view URL] . it also has SWITCH CASE OPTIONS for level 2,3 &4 unused Add level s “subtraction” and add level 3 “multiplication” each for two random numbers and add level 4 “finding cubic root of cubic numbers” like ∛24389 etc & “finding square root of square numbers” like √625 etc Level 1 : addition (already script written) Level2 ; subtraction (already script written) unused Level3 ; Multiplication (already script written) unused Level4 ; Division (already script written) unused Level 5: “finding cubic root of cubic numbers” like ∛24389 etc & “finding square root of square numbers” like √625 etc √squarenumber, ∛cubic number, (number )2, (number )3 After 50 games certificate should be linked in the hall of fame and user result table. Hall of fame should include number of games played including all 4 levels Accuracy percentage. Number of correct answers/total number of games * 100