1, Enable the hidden battle mode, Training Battle. It is a place to test your skill or battle with your friend.
2, Enable Replay feature. It records every battle you played inside a replays folder.
3, Watching last battle and some other useful features.
*Please note that Training Battle and Replay feature are just hidden features from the game.
*When Training Battle is enabled, please do not change battle options in game. Just click Battle for Training Battle. When battle mode is changed, Training room has to be re-enabled.
Thank Hox_Warwolf, Nostalgia_J, cSHIELD, xXCOLDBLADEXx and HenryQuan for testing and support.
WoWs has officially supported Training Room so this is no longer necessary.