Windows Phone gamers have been anxiously awaiting the start of the 6 Weeks of Must Have Games promotion. It was initially thought to begin in April, but then we learned it had been pushed back to an unspecified date. Shortly thereafter at MIX 2011, Joe Belfiore announced that Angry Birds would come out on May 25, so everyone assumed that the Must-haves would roll out then.

As it turns out, May 25 does indeed mark the start of the 6 Weeks of Must Have Games. But Angry Birds won’t be next week’s Xbox Live release after all. Instead, that honor goes to Hydro Thunder Go, the only Windows Phone-exclusive title in the Must-Have lineup. Leading with the strongest title is a smart idea, as Hydro Thunder Go has some great buzz surrounding it. Hydro Thunder Go will launch on May 25 at the very fair price of $4.99.

But that’s not all! We’ve got the full Xbox Live release schedule for the next 6 weeks, including prices and screenshots. Head past the jump for the exciting details.

Hydro Thunder Go – May 25, $4.99

Blast through 12 ferocious courses with the powerboat of your choice and compete against 15 devious opponents with strategic use of your Hydro Boost power, Mighty Hull and Hydro Jump abilities. In addition to visually stunning environments and insane track layouts, the ever-changing water conditions keep the races varied and interesting.

Doodle Jump – June 1, $2.99

Jump, jump, jump to the top, top, top with “Doodle Jump,” the runaway hit! Guide the Doodler on a springy journey up the never-ending sheet of graph paper to see how far you can climb. Leap from platform to platform, finding your way higher and higher using brilliant contraptions such as springs, propeller hats and jet packs. Avoid broken platforms, menacing black holes, UFOs and baddies. Blast them with your nose balls!

geoDefense – June 8, $2.99

Obliterate a horde of vibrant, vector-styled enemies in this fast-paced tower defense game. Devastate creeps with blasters, lasers and missiles and watch their energy debris swirl through the gravity wells of your vortex towers Demonstrate your pixel-blasting skill to all your friends on Xbox LIVE Leaderboards and earn Achievements as you hone advanced defense strategies.

Sonic the Hedgehog 4: Episode I – June 15, $6.99

The sequel fans have waited 16 years for is finally here!

Featuring enhanced gameplay elements, including the classic Sonic Spin Dash, and the versatile Homing Attack, Sonic 4 picks up right where Sonic and Knuckles left off. Dr. Eggman's back, and in an effort to finally rid himself of Sonic, he revisits and improves the very best of his creations. Get ready for the next chapter in an all new epic 2D saga built for old and new fans alike.

Plants vs Zombies – June 22, $4.99

Get ready to soil your plants - Plants vs. Zombies™ is coming to Windows Phone! A mob of fun-loving zombies is about to invade your home, and the only defense is your arsenal of plants. Use peashooters, wall-nuts, cherry bombs and more to mulchify 26 types of zombies before they reach your front door. The fun never dies!

Angry Birds – June 29, $2.99

Angry Birds is coming to Windows Phone! The survival of the angry birds is at stake. Dish out revenge on the green pigs who stole the birds’ eggs. Use the unique destructive powers of the angry birds to lay waste to the pigs’ fortified castles. Each of the 195 levels requires logic, skill and brute force to crush the enemy.

The prices are pretty much as expected on these games. Sonic 4 is the most expensive of the bunch, but previous high-profile console ports have been $6.99 too (see I Love Katamari and Pac-Man Championship Edition DX). At any rate, Xbox Live fans have plenty to look forward to in the month of June.