On the Subject of IKEA Plushies

My beloved...

The module takes place on a 3×5 grid representing an IKEA®. Pressing the button in each corner of the module will move your position one space in that diagonal direction on the grid. The grid wraps around in all directions. (the IKEA® is infinite.)

There will also be 4 tiles on the grid that cannot be moved onto; doing so will incur a strike and reset the module to its initial state. The positions of these tiles can be determined using the table on the next page with the first serial number digit.

Each IKEA® plushie on the module has a position on the grid. Use the calculation table on the following page to determine each plushie’s position. Your starting position is equal to the sum of the serial number digits.
If any of these are not within the range 1–15, add or subtract 15 until they are.

These positions signify locations in reading order on the grid. The plushies and starting position cannot be on an unvisitable tile. If any are, move these positions 4 spaces in reading order, looping around, until they are not.

Pressing the button at the top of the module will collect all plushies at the current position. Once all 4 plushies have been collected, the module will solve. Pressing this button when not on a tile with a plushie will incur a strike.

When calculating the positions of plushies, A, B, C, and D refer to the first, second, third, and fourth digits of the serial number (if applicable). If any of these digits are 0, replace them with 10.

Grids:

0
x
x
x
x
1
x x
x
x
2
x
x
x
x
3
x
x x
x
4
x
x
x
x
5
x x
x
x
6
x
x
x
x
7
x
x
x
x
8
x
x
x
x
9
x
x
x x

Calculation Table:

Plushie Name SN has 2 digits: SN has 3 digits: SN has 4 digits:
BLÅHAJ A+B A*B+C A*B+C*D
DJUNGELSKOG A A-B A+B+C A+B+C+D
KRAMIG A+2B A*B*C A-B+C-D
GOSIG A*B A+B*C (A+B+C)*D
JÄTTESTOR A+B+7 A+B-C A*(B-C)*D
JÄTTELIK A+B-3 (A-B)²+C A*B-C*D
DJUNGELSKOG B (A*B)-10 A-B+C A²-B²+(C*D)
SNUTTIG 3A-B A+2B-3C (A-8)+(B*C*D)
BRUNBJÖRN A²+B² A²+B²+C² (A²+B²)-(C²+D²)
KNORRIG 2A-B A-B-C A*B-C+D
LILLEPLUTT 3A+3B 2A+2B-C A+2B+3C+4D
DJUNGELSKOG C A²-B² A-B*C A*B+C-D

Plushie Reference:

BLÅHAJ DJUNGELSKOG A KRAMIG GOSIG
JÄTTESTOR JÄTTELIK DJUNGELSKOG B SNUTTIG
BRUNBJÖRN KNORRIG LILLEPLUTT DJUNGELSKOG C