Dear Mr. Arnold,
With this cover letter, I would like to apply for your open position of Game Tester. I saw your advertisement online, and am very experienced and interested in this field. I have included my resume.
For the past six years, I have been working as a Game Tester for OpenPath Products. In that time, I have gained considerable experience in testing new and existing prototypes for game sales. I have been instrumental in the design and implementation process, and have added much appreciated feedback and analysis to this end. I have always been very technically inclined and love computer games.
I really want to meet with you in person so that I can further discuss how I can be a real asset to your company. I thank you to call me at your earliest convenience at (555)-555-5555 to schedule a meeting for this. Thanks so much for your time.