Once upon a time there was a logical game Shih Dao - I liked it and got curious: what does the game title mean and what are the signs on tiles? Unfortunately, game help doesn't say a word about it.
There are six different signs used, by browsing Chinese signs lists I managed to identify 中 and 大 but failed to find the other four. As I have no idea about Chinese alphabet, I think of them as "house" (several ones in top-right of the screen), "zigzag" (one purple in top-right), "dancer" (several in the center) and "basket" (four in bottom-right), which probably has nothing to do with their actual meanings.