what do you use the crystals for apocylpse roblox

In Survive the Apocalypse on Roblox, crystals are usually used as an upgrade/crafting resource, but the exact use can vary by game update. From the available game-related results, crystals are tied to power-ups, weapon upgrades, or special items rather than being just a plain currency.

What they likely do

• Unlock or upgrade stronger gear.
• Improve a weapon or ability.
• Sometimes act as a rare resource for special features or new content.

Important note

I couldn’t verify one single, official crystal use for this exact Roblox game from the available results, so the safest answer is that crystals are a progression material used for upgrades or special unlocks.

If you mean a different Roblox game

Some Roblox games use crystals very differently. For example, in other games they can be a currency, a skill modifier, or a crafting item.

TL;DR: In Survive the Apocalypse , crystals are most likely for upgrades or special unlocks, not just collecting.