You have to solve current level before advance
[vexed] / blocks / original /
drwxr-xr-x   ..
-rw-r--r-- 2102 block1.bmp
-rw-r--r-- 2102 block2.bmp
-rw-r--r-- 2102 block3.bmp
-rw-r--r-- 2102 block4.bmp
-rw-r--r-- 2102 block5.bmp
-rw-r--r-- 2102 block6.bmp
-rw-r--r-- 2102 block7.bmp
-rw-r--r-- 2102 block8.bmp