Sandbox is the correct place to turn a showcase into a repeatable test. EA+ added the feature alongside Unit Showcase and custom AoE indicator colors. It is for controlled comparison; do not assume a test grants progression rewards unless the current screen says so.
Mode index
Recommended run plan
Create a baseline sheet for the unit at level, evolution, Potential and trait. Run the full upgrade path, then change exactly one part of the build. For support units, record team damage or coverage; for control, record uptime and immunity; for farmers, record clear time rather than a single hit.
Team and reward checklist
- Disable or document every global buff.
- Use the same target, duration and speed.
- Capture the unit panel before and after.
- Confirm the winning setup in Story, Expeditions or Raids.
Mode questions
Does Sandbox prove a unit is best?
It proves controlled performance. Real maps add routes, economy, enemy immunity and objectives, so the winner must survive a live-mode check.
What should I test first?
Placement cost and early upgrade breakpoints. A unit with huge max damage can still be poor if it reaches that damage too late.