This patch unlocks all Battle Mode hidden stages, it also works with the NTSC patch provided by GhostlyDark, included a patch for those who wants to use it in the Japanese ROM.
Name:Super Bomberman 3 (Europe).sfc
CRC32: A096A6E5
CRC64: 465B81882A60769E
SHA1: 14886D0FA66AF3BD919C354B2AD6FBB8892AD0AE
SHA256: 3C665283C14F050B60FE9693B12E437288BCD4AA3E56EF25106D503C44E0FDA5
Name: Super Bomberman 3 (Japan).sfc
CRC32: 9ECB0FE6
CRC64: FDDFAADDA13E7D26
SHA1: CF2D907848A4619B4AEA0EF61526A4C44A82F905
SHA256: D72CA4C66D58A19DBA854BC4599BAF4541B6ABCB9037700D338C26A59D119DF1