In a first for the MOBA title, Valve's The International Dota 2 worldwide championships has hit a whopping $4 million in prize pool totalling thanks to its 2014 Compendium sales.

Valve opened up sales on the digital program over the weekend, with a price tag of $10 and every $2.50 going towards the prize pool contributions. To begin with the prize pool was at $600,000 but quickly grew to $2.2 million. Compendium contributions from last year's The International prize pool saw $2.8 million total raised.

The popular developer and creator of Steam is also offering various in-game rewards for Compendium owners and Dota 2 players as the prize pool hits stretch goals. Current unlocked rewards include a Mini-Pudge courier, a new game mode titled All Random Deathmatch, loading screen unlocks, chat emoticons and more. More details about The Compendium, which allows fans to keep up to date with competitors and matches, and its fundraising stretch goals are on The International's official site.

The finals are schedule for July 18th to 21st at KeyArena in Seattle, with regional qualifiers currently underway in eight countries. Last year saw Alliance beat Natus Vincere, winning more than $1.4 million in prize money.