The pack marks three light levels on blocks: 0, 1 and 15. Each one tells you something different about your surroundings.
What each marking means
- Light level 0 shows the darkest blocks. Hostile mobs can spawn here. Treat every block with this marking as a problem spot.
- Light level 1 shows blocks with very little light. These blocks are close to dark but not fully dark. The marking helps you decide exactly where a torch should go.
- Light level 15 shows the brightest spots in the game, such as blocks right next to a strong light source. Use it to confirm where your light sources are and how bright the area right around them is.
Reading an area quickly
1. Stand still and look across the floor of the area you care about.
2. Find the blocks marked 0 first, because those are where monsters come from.
3. Look for blocks marked 1 next. They show where the light from your existing torches is nearly used up.
4. Find the blocks marked 15 to see where your light sources sit.
5. Compare the three. Brightness fades with distance from the light source, so you'll usually see the darkest markings farthest from your lights.
Once you can spot these patterns, you can judge whether a room is safe almost at a glance.