Vou por o GameOutput que aparece agora aqui para vocês verem.
[20:15:20] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[20:15:21] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[20:15:21] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[20:15:21] [main/INFO] [FML]: Forge Mod Loader version 7.99.36.1558 for Minecraft 1.7.10 loading
[20:15:21] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 7:amd64:6.1, installed at C:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_25
[20:15:21] [main/INFO] [FML]: Loading tweaker net.minecraftforge.lex.legacyjavafixer.LegacyJavaFixer from legacyjavafixer-1.0.jar
[20:15:21] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[20:15:21] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.lex.legacyjavafixer.LegacyJavaFixer
[20:15:21] [main/INFO] [FML]: [LegacyJavaFixer] Tweaker: cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker@6b57696f
[20:15:21] [main/INFO] [FML]: [LegacyJavaFixer] Replacing tweaker cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker@6b57696f with net.minecraftforge.lex.legacyjavafixer.LegacyJavaFixer$SortReplacement@5bb21b69
[20:15:21] [main/INFO] [FML]: [LegacyJavaFixer] Tweaker: FMLCorePlugin {[]}
[20:15:21] [main/INFO] [FML]: [LegacyJavaFixer] Tweaker: FMLForgePlugin {[]}
[20:15:21] [main/INFO] [FML]: [LegacyJavaFixer] Tweaker: cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker@6b57696f
[20:15:21] [main/INFO] [FML]: [LegacyJavaFixer] Replacing tweaker cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker@6b57696f with net.minecraftforge.lex.legacyjavafixer.LegacyJavaFixer$SortReplacement@5bb21b69
[20:15:21] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[20:15:21] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.lex.legacyjavafixer.LegacyJavaFixer$SortReplacement
[20:15:21] [main/INFO] [FML]: [LegacyJavaFixer] Replacing sort
[20:15:21] [main/INFO] [FML]: [LegacyJavaFixer] Detected TerminalTweaker
[20:15:21] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.lex.legacyjavafixer.LegacyJavaFixer$SortReplacement
[20:15:21] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.lex.legacyjavafixer.LegacyJavaFixer
[20:15:21] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:15:23] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[20:15:23] [main/INFO] [FML]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[20:15:23] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:15:23] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLDeobfTweaker
[20:15:24] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.TerminalTweaker
[20:15:24] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.TerminalTweaker
[20:15:24] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[20:15:25] [main/INFO]: Setting user: SwxG0D
[20:15:27] [main/INFO] [STDOUT]: [net.minecraft.client.main.Main:main:144]: Completely ignored arguments: [--nativeLauncherVersion, 307]
[20:15:27] [Client thread/INFO]: LWJGL Version: 2.9.1
Tentei e não deu certo =/ O launcher do Minigames nem abre. Já o do minecraft original abre, mas não inicia o jogo.