Last Z: Survival Shooter Tech Research Upgrade Order Guide

The most effective tech research path in Last Z: Survival Shooter prioritizes unlocking Tier 9 Alliance Duel chests before investing heavily in military combat trees. Securing top-tier Duel chests creates a self-sustaining income of Research Badges, diamonds, and speedups. Once your Duel point multipliers are established, progression shifts to Base Development speed nodes, a single troop branch, and march queue expansions.

Maximize Alliance Duel Tech for Daily Resource Income

Alliance Duel (VS) research is the foundational tree for account progression. Completing this tree lowers the inventory thresholds required to clear daily event phases, allowing you to earn top-tier rewards without depleting your hoarded items.

• Score Multipliers: Upgrade nodes covering Gathering Day, Building and Research Day, and Troop Training Day to multiply the points earned from normal daily tasks.
• Tier 9 Chest Milestone: Push directly toward the final nodes in the Alliance Duel branch. Tier 9 chests award recruitment tickets, diamonds, universal speedups, and the Research Badges necessary for high-level military nodes.
• Resource Preservation: Higher point multipliers let you hit maximum chest tiers each day using routine stamina and daily speedups rather than burning emergency reserves.

Clear Early Base Development Breakpoints

Before pouring resources into advanced combat nodes, upgrade the Base Development tree to reduce account-wide timers.

Invest strictly in flat percentage reductions for construction time, tech research duration, and hospital healing costs. Securing early research acceleration nodes compounds over time, significantly lowering the speedup requirements for every subsequent tree.

Avoid over-investing in field gathering nodes within this branch. Basic gathering nodes yield minimal returns compared to radar tasks and Alliance Duel chests. Stop upgrading Base Development once you hit the major speed milestones, then redirect your Research Institute toward Alliance Duel and combat trees.

Specialize in a Single Troop Branch

Upgrading Tank, Missile, and Aircraft trees simultaneously dilutes your combat power and rapidly drains your Research Badges and gold. High-tier combat research requires deep specialization.

1. Pick One Unit Type: Match your tech path to your strongest squad formation (such as Tank or Aircraft).
2. Prioritize Combat Stats: Maximize raw attack, defense, and HP nodes. Bypass or delay utility stats like movement speed or load capacity when navigating the branch.
3. Upgrade Troop Promotion Nodes: Prioritize promotion tech to reduce the training time and resource costs of fielding higher-tier units.
4. Leave Secondary Squads at Baseline: Keep secondary and tertiary unit branches at basic operational levels until your primary squad finishes its main military milestones. A fully specialized lineup consistently outperforms split-investment lineups of equal overall power.

Expand Garage Queues for Operational Efficiency

March queues control how many tasks your base can handle simultaneously across the map. Progress through the Garage and March expansion branches to gain operational flexibility.

Unlock the fourth squad dispatch slot as soon as your Headquarters and Research Institute fulfill the building prerequisites. Additional queues allow you to complete daily radar missions, gather resources, and join alliance rallies without pulling your main combat squad off defensive duty. Focus strictly on unlocking the physical march slots first; avoid investing in minor vehicle stat nodes for secondary marches until your main formation is secure.

Transition to Late-Game Military Trees

After completing the Alliance Duel tree and maxing your primary unit branch, transition your Research Institute toward Advanced Military, Leaders' Will, and T10 unit prerequisites.

These advanced branches require substantial badge investments and long timers. Time the completion of all major research projects to coincide with the Tech Research day of the Alliance Duel cycle to maximize event points. Always compare the badge cost against the combat gain before starting deep nodes. If an advanced military node requires thousands of badges for a marginal 1% stat increase, redirect those badges toward essential vehicle utility or secondary squad basics first.