Part 2 of 3: CGR Macro Review of the DEFENSE GRID LOCKDOWN level from Defense Grid Gold on OnLive. This awesome tower defense game has amazing gameplay and tons of cool levels. Lockdown is one of the most challenging and frustrating levels to gold medal in the game, how do you gold medal Lockdown in Defense Grid? This review / Defense Grid Lockdown level walkthrough shows you gameplay from Defense Grid gold in a Let's Play format walkthrough mixed with a level review detailing how to win at and play Defense Grid.