Bonus Level 1

1. Upgrade base twice
2. Chop down tree and build farm
3. Clear lot at left
4. Build log house and upgrade twice (this will be your primary source of silver and it doesn't seem to get infected)
5. Chop down trees
6. Build druid's hut
7. Upgrade base
8. Build another druid's hut when you can
9. Use x2 bonus to get wood (need 20 at one point)
10. Click on the darn rats to keep them from infecting more buildings

Bonus Level 2

1. Upgrade base
2. Build chamber
3. Clear lot and build mill
4. Upgrade chamber
5. Upgrade base
6. Clear lot of pile of rocks
7. Build sawmill
8. Upgrade chamber
9. Upgrade base
10. Build ladder down and build druid's hut
11. Activate pillars and pick up crystals
12. Clear up to air station and build stone quarry
13. Build air stations
14. Build 5 wells

Bonus Level 3

1. Upgrade base
2. Build estate
3. Clear lot and light fire
4. Build mill
5. Run mill and build ladder
6. Upgrade estate
7. Upgrade base twice
8. Put out fires
9. Upgrade estate
10. Build sawmill
11. Build boatyard
12. Put out fire in boatyard at bottom right
13. Put out fires
14. Clear lot and build druid's hut to access blue crystals
15. Build ladder and put fires out up to the plateau
16. Build left boatyard and finish fire extinguishing
17. Keep enough fires lit to show the 4 stumps
18. Restore stumps using silver

Bonus Level 4

1. Upgrade base
2. Build fortress
3. Clear rock and build mill
4. Upgrade fortress
5. Clear rock up at top
6. Upgrade base twice
7. Fill puddle and build sawmill
8. Build bridge when you have the stone
9. Clear rock and build quarry
10. Upgrade fortress
11. Build bridge to center and then go straight across (you can skip the other one)
12. Clear lot and build druid's hut
13. Collect crystals and activate 4 pillars
14. Build the ship