You should dress just one notch above how you would dress in the job. Are you applying for a job in marketing video games? If so, a tie would not be out of place. Are you applying for a job in testing video games? If so, don't wear shorts and sandals, wear long pants and shoes with socks instead.
Slacks and a button-down-collar shirt and nice shoes would be overdressing for a QA job, and underdressing for a marketing job.
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