Dota 2 prize pool for The International hits $6M (update: new stretch goals added)

The International 2014 — Dota 2's world championship event — has surpassed the $6 million mark and unlocked its final stretch goal, base customization.

The prize pool began with $600,000 earlier this month. In preparation for The International 2014, Valve is selling a virtual booklet called the Compendium with "dozens of ways to interact" with the tournament. For every Compendium sold, $2.50 is contributed to the pool and used to unlock new rewards.

The 13th and final goal, base customization, allows Compendium owners an item to customize a building on their base. Previous stretch goals added improvements such as new matchmaking, music, emoticons and a special edition heads-up display.

The International 2014 will take place July 18-21 in Seattle. Last year's Compendium sales helped boost the prize pool to $2.8 million.

Update: Valve added nine new stretch goals for the prize pool today, in various increments from $6.8 million all the way up to $10 million. The goals include voting for heroes to receive an alternate voice pack and a revised character model.