I also really like Nickle Arcade because you still had to drop a coin in their machines to play. Magnetic credits on a card just aren't the same. Even freeplay isn't entirely nostalgic. Accidentaally knocking your cup of coins all over the floor, and then panicking as a bunch of strangers stoop to help you pick them up wondering how many they are pocketing captures the good-old days right on the money... literally.
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Space Invader Reboot is actually a whole lot of fun.