Bill Pile Mopping:
1. Scatter 150+ loose bills around your workspace
2. F-grab at least 101 of them - you'll get a pile in your hands
3. Roll the pile over other loose bills and watch them get absorbed automatically
4. Congratulations, you're mopping!

Pack Pile Mopping:
1. Create 120+ money packs (any denomination)
2. Put them in a close radius - you'll get a pile.
3. Scan the pile, if it has more than 6,000 bills, reduce it first or F-grab won't give you a pile!
4. F-grab the pile once the scanner says it has less than 6,000 bills and roll it over other packs and watch them get absorbed automatically
5. Congratulations, you're mopping!

Formation: A pile is formed when 101 or more items of the same type are gathered within a certain radius.

Types: There are two distinct types of piles in the game: bill piles (formed from loose individual bills) and pack piles (formed from money packs that contain multiple bills).

Limits: No upper limit on pile size has been found, your game will crash first. The smallest it can be is 51 individual items, once it gets to 50 or below it will "pop" or explode into loose items again.

Game Treatment: The game engine treats piles as single entities rather than collections of individual items, which improves performance but creates unique interaction behaviors.

Order System: When you remove items from a pile, they follow a FIFO (First In, First Out) system, meaning the oldest items that were added to the pile will be the first ones to come out.

To understand pile manipulation limits and behaviors, you need to know how pack volumes work:

Pack Capacity: Each money pack can hold up to 100 loose bills. You cannot exceed this limit when creating packs.

Volume Calculation: Pack volume is calculated as the number of bills in the pack divided by 20. For example, a pack with 60 bills has a volume of 3 (60 ÷ 20 = 3). This volume calculation is crucial for understanding F-grab limits with pack piles.

Loose Bill Volume: Every loose bill has a volume of exactly 1, regardless of denomination or condition.

Single Removal: You can extract one item at a time from any pile by clicking on it. This follows FIFO order and is useful for precise control or when you need specific items from the pile.

Fill Hands: This action grabs up to 100 loose bills or up to 30 packs from the pile, following FIFO order. Note that it's not strictly volume-based but has specific item count limits.

F-grab: The most versatile grab method. When used generally, F-grab will collect everything in front of you up to 300 volume (including any items, not just bills and packs). When specifically targeting a pile, it will grab only from that pile up to 300 volume, following FIFO order.

Piles behave like katamari balls - when you carry a pile and move it near matching item types, those items get absorbed into the pile automatically. This creates a powerful "mopping" effect that allows you to efficiently collect scattered items across your workspace by rolling your pile through them.

Bill pile mopping is the most reliable application of this technique. Since F-grab can handle up to 300 volume and the minimum pile size is 101 bills, you're guaranteed to get a pile when F-grabbing from any bill pile (300 > 101). The strategy is straightforward: F-grab any existing bill pile and carry it around your workspace. As you move it near other loose bills or smaller bill piles, they will automatically be absorbed into your carried pile. This allows you to clean up massive amounts of scattered bills far faster than individually collecting each one. Bill piles have no maximum size limit, so you can keep absorbing indefinitely until your game performance suffers.

Pack pile mopping is significantly more complex due to the interaction between F-grab volume limits and pile formation requirements. Pack piles are formed from 101+ packs and remain stable down to 51 packs, but the volume of each pack depends on how many bills it contains (2-100 bills per pack). F-grab has a limit of 6,000 total bills, which translates to anywhere from 60 packs (if they're all full at 100 bills each) to 3,000 packs (if they're nearly empty at 2 bills each).

The critical risk is pile dissolution: if your F-grab removes enough packs to drop the remaining pile below 51 packs, the pile will "pop" and explode into individual packs. Even worse, the packs you just grabbed will also become loose individual items in your hands rather than staying as a manageable pile. The tactic is to scan the pack pile first - if it contains over 6,000 bills, you won't get a pile in your hands to use as a mop when you F-grab. Instead, you need to reduce the pile size using fill hands or single removal until it's under 6,000 bills, then you can F-grab the entire remaining pile and use it as a mop.