I've tried the Wagyan land games i've had, and they worked all three.
The first two games i've cleared the first stage, the third i played up to the fifth stage before turning the system off.
Checksums:
Wagyan Land (Japan)
SHA1: 7C4A68212DC7D36DAE8D351C916FFC6F2840B8B5
SHA256: 07C321274AFBCF72B14B2CE4EB50FE32A72EC3654F12E869BAD99D39CD4C5D0D
Wagyan Land 2 (Japan)
SHA1: 201D0C2A99ECFFB438EA8AB49422DB7CF3AB1C3F
SHA256: 55FD42BCF88149870B9B7E71496C3814C0338210B362152539A112CD7C1087C8
Wagyan Land 3 (Japan)
SHA1: 26D948027274172C902F6A3C89AEAB90C9C64754
SHA256: 6CB60A6E17DDE12704A1D72D86B3894B3D9E9CC3A2A0D08F603946D6FF381C1D
If need be i can check WaiWai World as well.