// çèìà
ds_grid_set_region(ds_dungeon, 0, 0, room_width / 32, room_height / 32, 0)
biome[2, 1] = irandom(room_width div 32)
biome[2, 2] = irandom(room_height div 32)
biome[2, 3] = irandom_range(3, 16)
biome[2, 4] = irandom_range(3, 16)
ds_grid_set_region(ds_dungeon, biome[2, 1], biome[2, 2], biome[2, 1] + biome[2, 3], biome[2, 2] + biome[2, 4], 1)
for(i = biome[2, 1]; i < biome[2, 1] + biome[2, 3]; i += 1)
{
    for(j = biome[2, 2]; j < biome[2, 2] + biome[2, 4]; j += 1)
    {
        chance[1] = choose(-1, 1)
        chance[2] = irandom(10)
        chance[3] = choose(-1, 1)
        if chance[1]
        {
            if chance[2] == 10
            {
                if chance[3]
                {
                    r = irandom(2)
                    ds_grid_set_region(ds_dungeon, i - r, j - r, i + r, j + r, 0)
                }
            }
        }
    }
}

for(i = biome[2, 1]; i < biome[2, 1] + biome[2, 3]; i += 1)
{
    for(j = biome[2, 2]; j < biome[2, 2] + biome[2, 4]; j += 1)
    {
        if ds_grid_get(ds_dungeon, i, j)
        {
            o = instance_create(i, j, block)
            o.type = 2
        }
    }
}