Map 20

Attacking

 * Once you have secured the flag, block as much of the way up to it as you can, since the defending team can easily go right back up otherwise. It can also be helpful to place conjuration before you secure the flag while you're reloading / ducking.

Defending

 * When the game starts, it's important to immedietly create another hole somewhere under the flag (often near the left corner). This is important as the original tunnel is very easily blocked, buying the attacking team lots of time. Even if it's not blocked, it causes bottleneck, ensuring the attacking team knows where you will come from.