Mystery Crank/Box

Box Crank

Standard Box Crank

Introduced in 2.0.0, the Box Crank is a new crank added to the game. Like the Event Crank, it's only available during limited-time events, with a different prize list upon each appearance. Plays are performed solely as 10x spins for 800 medals, although the first pull is free. The Box Crank only contains unit parts of all rarities, although the first also contained platinum and gold items.

Uniquely, all prize icons have equal odds, and are removed from the 250-icon prize pool as they appear, meaning that twenty-five 10x pulls will obtain the full set. Players can reset at any time, reverting the box back to its original state. It's also automatically reset when the box has been completely emptied. Resetting is only recommended when the best rewards are taken from the box.

Each Box Crank typically features a new "exclusive" unit which cannot be obtained via any other method. The prize pool contains five icons offering a combined 60 parts for this unit - one 30x, two 10x, and two 5x. As 80 parts are required to unlock, this means that the box has to be reset at least once in order to collect a sufficient quantity.

For every 100 spins (or 8,000 medals spent; 7,200 for the first 100 as the first pull is free), a special avatar is rewarded to the player, meaning that icons cost 7,200, 15,200, 23,200, 31,200 and 39,200 medals respectively. Limited-edition Box Cranks have a special emerald icon which requires 770 spins, costing 60,800 medals.

Campaign Box Crank

First introduced in 3.8.0, the Campaign Box Crank replaced the original Box Crank setup.

No units of the "Normal" rarity are in this type of box, and this type of box crank offers old limited box units (the all-times still make an appearance here); like the all-times in the normal box crank, obtaining these parts does not trigger the Genie's appearance. Along with the all-time units, several previously limited box units make an appearance, although with less parts than what a reproduction would generally offer.

The primary box unit has a changed feature - rather than a 30x part reward, it is replaced with an 80x. This means that a player could potentially get the box unit for free and potentially cheaper to a gold/platinum frame compared to a conventional Box Crank. Despite the increased pull cost from 800 to 1,500 medals, the Campaign Box offers significantly better odds compared to a standard Box Crank, due to the presence of the 80x reward. However, it's still recommended to have at least 25,000 medals on hand before attempting a Campaign Box Crank.

While pulling, there is a rare chance that a Regular Army Helicopter will appear after first pull, blasting all the original icons away in return for a set of new ones. This always causes a Genie to appear, and if the original pull would have caused a Genie to appear, then it is replaced with a Golden Genie.

Unlike normal box cranks, Campaign Box cranks unlock icons at different amounts; 200, 350 and 500 pulls, costing 28,500, 51,000 and 73,500 medals respectively. In addition, players automatically unlock the pre-acquisition frame of the featured unit upon obtaining 80 parts (which unlocks the unit). The safety net for the Campaign Box Crank is 36000 medals as this is enough to obtain all the items including the 80x reward for the first box.

During Dream Lotteries, each pull from the Campaign Box Crank yields six tickets.

Reproduction Box Cranks

Occasionally, incoming Box Cranks may be a simple reproduction of varied units. Initially with original Box Cranks they often reproduced the unit alone, with the occasional trio, especially during seasonal events.

Following the release of the Campaign Box Crank, reproduced Campaign Box Cranks always feature at least three units as pickup offers, while token amounts of other units can be obtained from them. Seasonal reproductions are more enhanced and offer the option of obtaining a 80x reward icon in addition to the standard 10x and 5x icons. Genies will appear if the roll yields any amount of parts from featured units or 80x from unfeatured ones; golden genies only appear for featured units as with a standard Campaign Box Crank.

TF Box Crank

The TF Box Crank is only available during a Task Force Extra Ops. Players can accumulate Task Force Crank Keys for every one run of the event in any difficulty, the accumulated total keys will be counted upon clearing all the stages.

Unlike the traditional Box Crank, Task Force has its own stages of Item Lists. Each stages has more list count than the former. The stages can be skipped if all the listed "HOT!" items are obtained, and obtaining the rest of the items left is optional. Stages 1-10 contain parts of the boss unit, one of all currently available status strengthening item and 100 medals. Stages 8 and 9 have the boss' skill 4 items, and stage 10 and 11 have the boss' skill 5 items.

As of Task Force 2nd, players can now perform a 100 plays at the cost of 1000 TF Crank Keys, and an instant result option was added as of Task Force 8th.

TF Crank Units List

Unit	Update	Faction
Rock Mole	4.9.0	Ptolemaic Army
Elder Centipede	4.13.0	Independent
Runaway Brain Robot	4.15.0	Space Army
Master Kraken	4.17.1	Rebel Army
D-GU	4.2.0	Ptolemaic Army
Astro Slug	4.23.0	Regular Army
Monoeye Gate	5.2.0	Space Army
Crusty Legs	5.5.0	Independent
Armored Crawler	5.10.0	Ptolemaic Army
Clone Incubator	5.14.0	Space Army
7000 Class Locomotive	5.16.0	Regular Army
Frozen Vortex	5.19.0	Rebel Army
Coil Tank	6.3.1	Regular Army
Jupiter Tank	6.6.0	Rebel Army
Guardian of the Crypt	6.8.1	Independent
King's Cocoon	6.10.1	Space Army
Glidron+	6.13.0	Ptolemaic Army
Fall Climber -Narutaki-	6.16.0	Rebel Army
Parasitic Giant Escargot	6.18.0	Space Army
Creek Slope	6.21.2	Rebel Army
GIP-03α Valkyrie	7.2.0	Ptolemaic Army
align="center"	Pile Impact Ver.Bison	7.5.0	Regular Army