Last Z: Survival Shooter Gacho Go Guide: Why Save 120 Wrenches

In Last Z: Survival Shooter, you should save a minimum of 120 wrenches before spending currency in the Gacho Go event. Reaching this specific threshold ensures you can complete high-efficiency reward tiers in a single event run rather than wasting currency on low-yield single pulls.

Why 120 Wrenches Is the Target Threshold

The Gacho Go event rewards players who accumulate currency for bulk pulls instead of spending wrenches as soon as they are acquired. Spending small amounts—such as 40 or 60 wrenches—risks leaving you stuck halfway through reward milestones without reaching the highest payout tiers.

Holding out for 120 wrenches provides distinct tactical advantages:

• Guaranteed Tier Completion: A bulk cache of 120 wrenches allows you to clear multiple reward milestones in one session, bypassing reliance on random drop rates for essential items.
• Synchronized Progression: Saving your wrenches lets you release a large influx of hero gear and facility upgrade materials right when you need them for seasonal pushes or server-wide Alliance Wars.
• Higher Resource Returns: Lower reward tiers mostly yield scattered baseline loot. Reaching the higher tiers unlocked by a 120-wrench hoard maximizes your total value per spent wrench.

How to Collect and Manage Your Wrench Hoard

Accumulating 120 wrenches requires steady resource management across event cycles:

1. Complete Daily Missions: Focus on all daily activities that award wrenches to establish a consistent income rate.
2. Stop Intermediate Spending: Ignore the temptation to spend partial stacks. Keep your wrench supply untouched until your balance reaches 120.
3. Track Event Timers: Check the Gacho Go event calendar regularly. If an active event is ending and you are short of the 120-wrench threshold, keep saving for the next cycle instead of dumping an incomplete hoard.

Strategy Trade-Offs and Constraints

The primary drawback of saving for 120 wrenches is delaying immediate gratification. Holding your currency means missing out on minor, short-term stat increases while you save. If your shelter progress or combat progression hits an absolute bottleneck early on, postponing pulls can briefly slow your pace.

However, for mid-to-late game shelter expansion and overall hero strength, the power spikes gained from a full 120-wrench Gacho Go run far outweigh the small incremental gains of spending wrenches early. Keep hoarding until you hit the mark, then spend all 120 in a single event window.