 Dota 2 includes a <unk> system , which is measured by a numerical value known as " <unk> rating " ( MMR ) . MMR is updated based on if a player 's team won or lost , which will then increase or decrease , respectively . The game 's servers , known as the " Game <unk> " , attempts to balance both teams based on each player 's MMR , with each team having roughly a 50 % chance to win in any given game . Ranked game modes with a separately tracked MMR also exist , which differ from unranked games by making MMR publicly visible , encouraging players who want to play in a more competitive environment , among other changes . The game also includes a report system , which allows for players to discourage and punish player behavior that intentionally provides a negative experience . Other features include an improved replay system from Defense of the Ancients , in which a completed game can be downloaded in @-@ client and viewed at a later time , and the " hero builds " feature , which provide integrated guides created by the community that highlight to the player on what items should be bought on their hero , and which abilities to level up . 
