File names for daily puzzles from December 2007:
20071203_s4_IQ_u52_c7_4_216.png
20071204_s3_BRAIN_u46_boxbreaks_c8_2_172.png
20071205_s2_THINKER_u20_one_c28_3_954.png
20071206_s1_COOL_c14_0_586.png
20071207_s0_EASY_c4_5_726.png
20071210_s4_IQ_u49_c22_6_863.png
20071211_s3_BRAIN_lol_u52_boxbreaks_c17_14_846.png
20071212_s2_THINKER_u23_boxbreaks_H_c21_8_378.png
20071213_s1_COOL_H_c18_1_781.png
20071214_s0_EASY_H_c23_7_960.png
20071217_s4_IQ_u44_H_c20_12_361.png
20071218_s3_BRAIN_u44_boxbreaks_H_c18_16_970.png
20071219_s2_THINKER_u11_one_c2_10_231.png
20071220_s1_COOL_c22_11_367.png
20071221_s0_EASY_X_H_c18_9_769.png
20071224_s4_IQ_u51_c16_15_769.png
20071225_s3_BRAIN_u36_either_c15_17_790.png
20071226_s2_THINKER_u25_boxbreaks_c22_18_667.png
20071227_s1_COOL_c6_19_790.png
20071228_s0_EASY_H_c21_13_854.png
20071231_s4_IQ_lol_u44_c22_2_540.png