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Prevent Cube Pickup

I've started to use the Hammer editor only recently, and it might be that I've simply overlooked this feature. However, I couldn't find it anywhere online, so I thought I'd ask here. My question is: Is there any way to prevent players from picking up cubes?

Further Explanation:
In my map, a cube is dropped and should be pushed by a robot arm. This blocks a laser, allowing the player to pass to the exit. Currently, the player doesn't have to activate the robot arm, because they could just pick up the cube and move it in front of the laser themselves. Is there any way to prevent the player from simply picking up the cube, and make it so only the robotic arm can move it?

Thank you in advance

I would suggest you change the layout of the map to account for the player not being able to block the laser with the cube. e.g. the laser is too high to be blocked or behind a fizzler and needs the mechanical arm to lift over it etc.

Physically stopping the player from doing something they should be able to only frustrates them. e.g. invisible walls

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You could also build a glass/grating box around the cube, which is attached to the panel. You can block pickup though - fire a DisablePickup input to the cube.

My stuff:
[spoiler]- BEE2 Addons | (BEE2)
- Hammer Addons
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- Gel is Not Always Helpful[/spoiler]

@TeamSpen210 - DisablePickup was exactly what I was looking for. Apparently Hammer does not know about that command applying to cubes, but it works very well. The other solutions work too, but this works best in my case. Thank you!

Cubes should be picked up normally, if not then it breaks the learned mechanics, unless you scale it up (bigger size) or re-texture to have an anvil or dumbbell icon in the middle.
If the cube is pickable it also means its pushable so preventing pickup cant really solve the problem, unless its impossible to block the laser just by pushing it around or using portals or other mechanics. Maybe you can make your own cube, change its weight or put a parented trigger around it so if player enters it it "stopmotion" or such, if leaves then enables (if tweaking weight makes it onmovable by the arm)

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In my case pushing is not a big problem. This particular puzzle is more to show a friend what can be done with the Hammer editor for a certain project. Indeed, pushing was a problem right now but honestly it doesn't matter too much. Later when we're going to use this for real I'll remember your advice.