it's the file called e1m1.c it has this:
CODE
YETI_ROM rom_map_t e1m1 = {
"Test Map","Derek J. Evans","Welcome to Yeti3D",{
{
{0,0,0,0,0,0,0,1,0,2,0,0},
{0,0,0,0,0,0,0,1,0,2,0,0},
{0,0,0,0,0,0,0,1,0,2,0,0},
{0,0,0,0,0,0,0,1,0,2,0,0},
{0,0,0,0,0,0,0,1,0,2,0,0},
{0,0,0,0,0,0,0,1,0,2,0,0}...