Q: How do I make sure I am ready to upgrade my HQ Level to 23 & 24?A: Make sure your current HQ level is 22. Also, Upgrade your Supply, Steel, and Tech Stockpiles at HQ Level 22 so that the resource caps will be greater than the HQ upgrade requirements.Q: What’s new at HQ levels 23 & 24? Why should I upgrade to new HQ levels?A: Upgrading to HQ Level 23 unlocks the Alpha Tower, a new and powerful defensive structure.
At HQ 24, you will also unlock a new Command Power: Camouflage.
Reaching Level 75 will also give you another Strike Force slot in game. You can use your Facebook friends as Strike Force.Additionally, you will be able to build another Rail Gun on your base, place more land mines and shock mines. You can also upgrade most of the Buildings, Troops, and Command Powers to make them more powerful.Details regarding the Command Power, Camouflage, can be found in the Research Agency.
Q: How does the new Defensive structure, Alpha Tower, work? A: The Alpha Tower is a structure that boosts the Hitpoints and Damage/sec for all the Buildings in its vicinity. Alpha Tower will play an important role in the placement of your defensive structures. If the Alpha tower is destroyed, the effect of the boost ends. The image below shows the radius and the effect of the Alpha Tower on the surrounding structures. 
Details regarding the new Alpha Tower can be found under Buildings | Defenses section. 
Q: Can I upgrade the Alpha Tower? If yes, how do I do that? A: Alpha Tower is unlocked at HQ Level 23. Upgrades for Alpha Tower are available at HQ Level 24. To upgrade the Alpha Tower, click on the Alpha Tower, tap on the upgrade icon and choose Upgrade or Instant.
Q: How does the new Command Power “Camouflage” work? A: The new Command Power “Camouflage” allows troops/units to move in the battle from one point to another undetected. The unique power can be used for both offensive and defensive purposes.Note: If troops move over Land mines or Shock mines the units under the effect of Camouflage, they will take damage. To move the troops under the effect of the Camouflage, you will need to use Flares or Control groups.
- Click on the Command Power, then apply it on the troops.
- Now move the troops from one place to another by dropping flares or using Control groups.
- You can use the Camouflage command power on any troop at any given point of time during the battle.
The image above shows the units under the effect of Camouflage. Once the command power is used, the troops stand still. You will need to use flares or control groups to move the troops.Q: Can I upgrade the duration of the Camouflage effect? If yes, how do I do that?A: Yes, you can upgrade the Command Power duration in the Research Agency.
Q: Can I have multiple Alpha Towers on my base?A: No, you can only have one Alpha Tower on your base.Q: Will the Alpha tower increase the Hitpoints and Damage of units on the Rally Flag?A: No, Alpha Tower only increases the Hitpoints and Damage of the buildings in its radius.
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Empires & Allies Game GUIDE