Every week, Last Z: Survival Shooter refreshes the Weekly Lucky Number — a rotating community bonus tied to a specific numbered Lucky Rose. Send the exact number of Yellow Roses that matches this week's active Lucky Rose to any one player, and you unlock that rose's bonus buff for your whole alliance. Below is everything you need to know, plus a full reference chart of what every Lucky Rose does and how to squeeze the most value out of your rose inventory each week.
9
Increases research speed by 20%
How the Weekly Lucky Number Works
Each Lucky Rose (numbered 1 through 10) is linked to its own unique buff, and one of them is selected as active for the week. The rules are always the same, no matter which number is currently active:
- Check the box above for this week's active Lucky Number.
- Send exactly that many Yellow Roses to any one player (a friend or an alliance member) in a single transaction, all at once.
- The bonus activates immediately for you — and shares the buff with your alliance.
Lucky Rose Buffs — Full Reference Chart
Here's what every numbered Lucky Rose grants whenever it happens to be the active one for the week:
Lucky Rose #1
+20% Construction SpeedIncreases construction speed by 20% for 2 hours.
Lucky Rose #2
+15% Troop LoadIncreases troop load capacity by 15% for 24 hours.
Lucky Rose #3
+30% Gathering SpeedIncreases gathering speed by 30% for 24 hours.
Lucky Rose #4
Allied Assist +120sAlliance help duration +120 seconds for 24 hours.
Lucky Rose #5
+20% Research SpeedIncreases research speed by 20% for 2 hours.
Lucky Rose #6
Allied Assist +120s (Double Help Time)Alliance help duration +120 seconds for 24 hours, with double help time active.
Lucky Rose #7
+10% Troop ATKIncreases troop attack by 10% for 2 hours.
Lucky Rose #8
+20% Construction SpeedIncreases construction speed by 20% for 2 hours.
Lucky Rose #9
+20% Research SpeedIncreases research speed by 20% for 2 hours.
Lucky Rose #10 (Gold)
+10% Troop ATKIncreases troop attack by 10% for 2 hours. Marked as the special Gold-tier rose.
How to Get the Most Out of the Weekly Lucky Number
The bonus itself only lasts 2–24 hours, but a few habits make a real difference to how much value your alliance squeezes out of it each week:
Time It With Active Play
Short 2-hour buffs (construction, research, troop ATK) are wasted if you're offline. Trigger the rose right before a farming, training, or rally session.
Stack With Reinforcement Buffs
When an Allied Assist rose (#4 or #6) is active, pair it with your alliance's help cap upgrades for maximum queue-clearing speed — see our Alliance Center guide for cap breakpoints.
Coordinate Rose Trading Early
Don't wait until the last minute to gather the exact rose count from allies. Set a designated "rose collector" per group so the trigger happens the moment the week resets.
Combine With Troop Formation Buffs
ATK-boosting weeks (#7, #10) hit hardest when layered on top of an optimized troop formation. Check our Formations guide for capacity and buff levels.
