Making some pocket money while studying abroad?

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This is for you students who have been or are planning to go abroad at some point during your studies, either undergraduate or graduate (or non-degree, for that matter). This September I will be studying abroad in Japan. I'll be there until February, and since I'm going to be living in Tokyo during this time, I'm going to need every extra dollar I can find. I've been trying to come up with some ways to get a bit of cash on the side without having to worry about a work visa. I'm considering doing some freelance work for websites (writing, mostly) if I can, though I've heard that tutoring overseas can work out pretty nicely as well. Does anybody have any other suggestions for this? I'm not looking for heaps of cash; if I could make even an extra $25 or more a week while I'm overseas, that'd be greatly helpful in ensuring I could eat a little more than ramen every day. I'm also accepting ideas for other countries, as well, since I'm planning to live/study in other countries in Asia... and in Europe eventually, too.