The Commodore 64 had only 64k ram minus what it took to give you the operating system. When you think of how small in memory it was and how addictive this game was to play, it makes wonder how and why we got to this stage where games take up GBs of memory with awesome graphics yet we can play games with this amount of effort and still say, No it looks good but I don`t like it! Boulderdash is still an addictive game to play. If you get the chance to - play it! Google Boulderdash XL