GREE has revealed its North American game studio has generated more than $29 million in revenues in the first half of 2012, while two of its first-party titles, the card-battle game Zombie Jombie and the iPad version of Modern War are seeing peak average revenue per daily active user (ARPDAU) in excess of $1.

According to new figures released today, GREE’s North American operations generated $12.1 million in revenue in the January and March, and $16.8 million in revenue between April and June, good for a 38 percent increase in sales quarter-over-quarter. Also of note is the fact that 40 percent of the company’s North American game revenues are coming from the iPad.

GREE credited the quarter-over-quarter increase in revenues to successes with its first party games and to the strength of Funzio’s titles, which joined the GREE stable in May when the company picked up the mid-core focused developer for $210 million.

GREE also reported that Funzio’s titles have seen their revenues increase by 27 percent between the first and second calendar quarters — i.e., before and after acquisition, a development it credits to the implementation of new monetization and user acquisition strategies.

Modern War’s performance on the top grossing iOS app charts over the last 30 days according to AppData.

While GREE’s North American earnings are impressive, they’re still dwarfed by the company’s main source of revenue — the domestic Japanese market. According to GREE’s most recent earnings report, the company’s total sales for the period were $508.6 million, which means its North American earnings accounted for just 3.3 percent of the quarter’s revenues. However, they’re also growing — during the quarter ending March 31, 2012 GREE saw record high revenues of $578.1 million, meaning its North American revenues were just 2.1 percent of its earnings.

Today’s announcement comes exactly one week after we reported GREE’s rival DeNA was seeing peak ARPDAU of $1 in its games Blood Brothers and Ninja Royale. According to DeNA’s most recent earnings report, the company sold $10 million worth of Moba-coins, its premium in-game currency in July alone.

Today’s news means both GREE and DeNA have been successful at bringing Japanese-style mobile monetization and ARPDAU figures to the North American market.  For reference, in its most recent earnings call, Glu Mobile revealed its highest iOS ARPDAU figure in June was $0.132. Looking back further, our readers may remember when Zynga filed for its IPO in June 2011 it was reporting ARPDAU of $0.04219. With both companies seeing ARPDAU figures three to six times higher than the North American average, it seems as the two companies battle it out for North American market share they’re also redefining the mobile-social gaming marketplace.