When you enter the screen where it says brain age check, training, graph and user options before you hit brain age check hold down select and you will be able to chose with tests you want to do!
If you want to get lots of stamps in one day, all you have to do is set the calender on your DS one day ahead after you have done the day's training.
When training for the "Word Scramble" game, and easy way to get all of the words right is to pass every single one and remember the word (maybe write it down).
After the last one, before it goes to the results screen, switch of the DS and turn it back on. Go back onto "Word Scramble" and the words are the same. So the only thing to slow you down is the speed at which your write.
But this is cheating, so if you want to improve properly then do the training properly.
If you make a mistake when doing Sudoku you could also try drawing a circle in the box to delete the nmber if it's incorrect.
Compleat one of your daily "brain train games"... once you've finished one, scroll down to the end of the entire list, including ones that are marked with no name, tap the last one you should get the "relaxing minigame before you've been given it.
Go to the Daily Training section and select your name, press and hold SELECT and pick Brain Age Check. This will open up a selection menu that lets you choose which three challenges you want to complete for the age check.
on the screen where it says what you have to do eg; masterpiece etc, scroll down to the very last section where you will have not yet achieved a game, just press it instead and there is a secret game called germs be warned though it is a very addictive game xxxx
Collect eleven stamps to unlock Hard mode for Calculations times one hundred game.
After you have got a stamp for the day, go to the last section where you didn't get a game yet and tap it. It's like Dr. Mario, and every day after that after you got a stamp you can scroll down and where you tapped the last time it will say Virus Buster in blue you can also pick easy medium or hard