Princess Peach and Luigi
If you get 100 coins 12 times (One for every hour) you will see Princess Peach and she will say Thankyou Mario and it will display the time it took for you to get 1200 coins. To get Luigi you need to get one hundred coins as Mario. There are also a few different stages and at each hour you will change stage and go to the castle at the end of each level on Super Mario Bros.
More tricks, tips and cheats for this game are right here - Mario Clock cheats
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