Like the codes say, hold down the combination right after you pick a stage. If you ask me they have a higher chance of working if you pick a random. None of them should freeze or desync... Sorry for the wierd button combination choice O_o If you want I'll tell you how to change it
Hold L+Z+Left for Practice Stage
* 284DE4B0 000000D1
* 4A000000 81000000
* 145E25D8 00000037
* E2000002 80008000
Hold the specified button down on the stage selection screem while loading.
Hold L+Z+Up for Target Test
* 284DE4B0 000000D8
* 4A000000 81000000
* 145E25D8 00000038
* E2000002 80008000
Hold the specified button down on the stage selection screem while loading.
Hold L+Z+Right for Result Stage
* 284DE4B0 000000D2
* 4A000000 81000000
* 145E25D8 00000028
* E2000002 80008000
Hold the specified button down on the stage selection screem while loading.
Hold L+Z+Down for Home Run Contest
* 284DE4B0 000000D4
* 4A000000 81000000
* 145E25D8 00000034
* E2000002 80008000
Hold the specified button down on the stage selection screem while loading.
Press L+Z+B for All Star Stage
* 284DE4B0 000001D0
* 4A000000 81000000
* 145E25D8 00000036
* E2000002 80008000
Hold L+Z+Left for Practice Stage
* 284DE4B0 000000D1
* 4A000000 81000000
* 145E25D8 00000037
* E2000002 80008000
Hold the specified button down on the stage selection screem while loading.
Hold L+Z+Up for Target Test
* 284DE4B0 000000D8
* 4A000000 81000000
* 145E25D8 00000038
* E2000002 80008000
Hold the specified button down on the stage selection screem while loading.
Hold L+Z+Right for Result Stage
* 284DE4B0 000000D2
* 4A000000 81000000
* 145E25D8 00000028
* E2000002 80008000
Hold the specified button down on the stage selection screem while loading.
Hold L+Z+Down for Home Run Contest
* 284DE4B0 000000D4
* 4A000000 81000000
* 145E25D8 00000034
* E2000002 80008000
Hold the specified button down on the stage selection screem while loading.
Press L+Z+B for All Star Stage
* 284DE4B0 000001D0
* 4A000000 81000000
* 145E25D8 00000036
* E2000002 80008000