This is the outermost layer of our defenses. Made from the strongest, most imposing concrete blocks in the land. No one gets past this point.
Proceed to the next sectionThis section is a little more... treacherous. Spikes of various lengths and angles will slow down even the most determined attacker.
Proceed to the next sectionThis section is a deep, bottomless pit filled with water, spikes, and other hazards. Don't get too close.
Proceed to the next sectionAnd so on...