The Bookstore: Accelerating Scientific Progress

Success in Last Z: Survival Shooter isn't just about troop numbers—it's about the technology behind them. The Bookstore is a specialized bonus building that provides a permanent boost to your Research Speed. Upgrading this building is the most efficient way to reduce the massive timers in the Laboratory.

Unlock Requirement: Headquarters Level 12
Assignable Refugee: Scientist (Assigning a scientist significantly boosts the effectiveness of this building).

+20% Speed at Level 10

+40% Speed at Level 20

+60% Speed at Level 30

Bookstore Upgrade Data

As you upgrade the Bookstore, both your research efficiency and your base power grow. Here are the key progression milestones:

Level	Research Speed Bonus	Base Power Increase
1	+2%	850
5	+10%	3,878
10	+20%	25,403
15	+30%	93,355
20	+40%	274,481
25	+50%	697,795
30	+60%	1,666,868

BLNW Alliance Strategy: Why the Bookstore Matters

To remain competitive in State #351, our members must prioritize the Bookstore alongside the Laboratory. A 60% speed increase means a 10-day research project can be completed much faster, saving you hundreds of diamonds and speed-ups over time.

Pro Tips:

Refugee Synergy: Never leave your Bookstore empty. Always assign your highest-tier Scientist refugee to maximize the passive bonus.
Power Efficiency: At Level 30, the Bookstore provides 1.6 Million Power, making it one of the best "non-combat" buildings for boosting your total rating.

Frequently Asked Questions

Q: Does the Bookstore speed up building construction?
A: No. The Bookstore only affects research conducted in the Laboratory. For construction speed, you need to focus on different buffs and hero skills.

Q: When should I start focusing on the Bookstore?
A: Start upgrading it as soon as you hit HQ 12. The early levels are cheap and the 20% boost at Level 10 is very noticeable.