A note from Stop

Builds up to exactly that - a crescendo.
Within 180s all hell breaks loose.
The challenge is to survive for 3 minutes.
Should you somehow manage this, only an even more intense loop awaits you.
Start radius
End radius
Shrinking rate
Brightness
70
30
0.222
84
Seconds
Spawns
Gems (no farm)
Total gems
1.6666
Spider I
1
1
1.6666
Spider I
1
2
1.6666
Spider I
1
3
6.5000
Spider I
1
4
6.5000
Spider I
1
5
10.0000
Spider I
1
6
10.0000
Squid I
2
8
16.5000
Spider I
1
9
23.1500
Spider I
1
10
29.8500
Spider I
1
11
36.7000
Spider I
1
12
49.7500
Squid I
2
14
49.7500
Squid II
3
17
49.7500
Squid III
3
20
67.2500
Centipede
25
45
67.2500
Squid I
2
47
77.2500
Gigapede
50
97
93.2500
Centipede
25
122
98.2500
Gigapede
50
172
113.2500
Centipede
25
197
117.2500
Gigapede
50
247
129.2500
Squid III
3
250
138.0000
Squid II
3
253
142.7500
Squid I
2
255
147.0833
Centipede
25
280
147.0833
Centipede
25
305
147.0833
Gigapede
50
355
150.7499
Thorn
0
355
150.7499
Thorn
0
355
150.7499
Thorn
0
355
154.0832
Spider II
1
356
157.4165
Squid III
3
359
160.7498
Spider I
1
360
164.0831
Squid I
2
362
165.0831
Squid II
3
365
165.5831
Squid II
3
368
165.7081
Squid II
3
371
165.8331
Squid III
3
374
165.8665
Leviathan
6
380
169.1833
Squid I
2
382
169.1833
Squid II
3
385
172.5167
Thorn
0
385
175.1833
Spider I
1
386
177.5167
Squid I
2
388
179.1833
Thorn
0
388
180.0000
Spider I
1
389
182.9667
Squid I
2
391
182.9667
Squid II
3
394
185.9333
Thorn
0
394
188.3000
Spider I
1
395
190.3833
Squid I
2
397
191.8667
Thorn
0
397
192.5667
Spider I
1
398
195.2333
Squid I
2
400
195.2333
Squid II
3
403
197.9000
Thorn
0
403
200.0333
Spider I
1
404
201.9000
Squid I
2
406
203.2333
Thorn
0
406
203.8833
Spider I
1
407
206.3167
Squid I
2
409
206.3167
Squid II
3
412
208.7333
Thorn
0
412
210.6833
Spider I
1
413
212.3833
Squid I
2
415
213.5833
Thorn
0
415
214.1667
Spider I
1
416
216.4000
Squid I
2
418
216.4000
Squid II
3
421
218.6167
Thorn
0
421
220.4000
Spider I
1
422
221.9500
Squid I
2
424
223.0667
Thorn
0
424
223.6000
Spider I
1
425
225.6667
Squid I
2
427
225.6667
Squid II
3
430
227.7167
Thorn
0
430
229.3500
Spider I
1
431
230.7833
Squid I
2
433
231.8167
Thorn
0
433
232.3000
Spider I
1
434
234.2167
Squid I
2
436
234.2167
Squid II
3
439
236.1167
Thorn
0
439
237.6333
Spider I
1
440
238.9667
Squid I
2
442
239.9333
Thorn
0
442
240.3833
Spider I
1
443
242.1667
Squid I
2
445
242.1667
Squid II
3
448
243.9500
Thorn
0
448
245.3667
Spider I
1
449
246.6167
Squid I
2
451
247.5000
Thorn
0
451
247.9333
Spider I
1
452
249.6000
Squid I
2
454
249.6000
Squid II
3
457
251.2667
Thorn
0
457
252.6000
Spider I
1
458
253.7667
Squid I
2
460
254.6000
Thorn
0
460
255.0167
Spider I
1
461
256.6000
Squid I
2
463
256.6000
Squid II
3
466
258.1667
Thorn
0
466
259.4167
Spider I
1
467
260.5167
Squid I
2
469
261.3000
Thorn
0
469
261.6833
Spider I
1
470
263.1667
Squid I
2
472
263.1667
Squid II
3
475
264.6500
Thorn
0
475
265.8333
Spider I
1
476
266.8833
Squid I
2
478
267.6167
Thorn
0
478
267.9667
Spider I
1
479
269.3833
Squid I
2
481
269.3833
Squid II
3
484
270.7833
Thorn
0
484
271.9000
Spider I
1
485
272.8833
Squid I
2
487
273.5833
Thorn
0
487
273.9333
Spider I
1
488
275.2667
Squid I
2
490
275.2667
Squid II
3
493
276.6000
Thorn
0
493
277.6667
Spider I
1
494
278.6000
Squid I
2
496
279.2667
Thorn
0
496
279.6000
Spider I
1
497
280.8833
Squid I
2
499
280.8833
Squid II
3
502
282.1500
Thorn
0
502
283.1667
Spider I
1
503
284.0500
Squid I
2
505
284.6833
Thorn
0
505
285.0000
Spider I
1
506
286.2167
Squid I
2
508
286.2167
Squid II
3
511
287.4333
Thorn
0
511
288.4000
Spider I
1
512
289.2500
Squid I
2
514
289.8500
Thorn
0
514
290.1500
Spider I
1
515
291.3167
Squid I
2
517
291.3167
Squid II
3
520
292.4833
Thorn
0
520
293.4000
Spider I
1
521
294.2167
Squid I
2
523
294.8000
Thorn
0
523
295.0667
Spider I
1
524
296.1833
Squid I
2
526
296.1833
Squid II
3
529
297.3000
Thorn
0
529
298.1833
Spider I
1
530
298.9667
Squid I
2
532
299.5167
Thorn
0
532
299.7833
Spider I
1
533
300.8500
Squid I
2
535
300.8500
Squid II
3
538
301.9167
Thorn
0
538
302.7833
Spider I
1
539
303.5167
Squid I
2
541
304.0500
Thorn
0
541
304.3167
Spider I
1
542
305.3500
Squid I
2
544
305.3500
Squid II
3
547
306.3833
Thorn
0
547
307.2000
Spider I
1
548
307.9167
Squid I
2
550
308.4333
Thorn
0
550
308.6667
Spider I
1
551
309.6667
Squid I
2
553
309.6667
Squid II
3
556
310.6500
Thorn
0
556
311.4333
Spider I
1
557
312.1333
Squid I
2
559
312.6333
Thorn
0
559
312.8667
Spider I
1
560
313.8333
Squid I
2
562
313.8333
Squid II
3
565
314.7833
Thorn
0
565
315.5333
Spider I
1
566
316.2000
Squid I
2
568
316.6833
Thorn
0
568
316.9167
Spider I
1
569
317.8500
Squid I
2
571
317.8500
Squid II
3
574
318.7667
Thorn
0
574
319.5000
Spider I
1
575
320.1500
Squid I
2
577
320.6000
Thorn
0
577
320.8167
Spider I
1
578
321.7167
Squid I
2
580
321.7167
Squid II
3
583
322.6000
Thorn
0
583
323.3167
Spider I
1
584
323.9333
Squid I
2
586
324.3833
Thorn
0
586
324.6000
Spider I
1
587
325.4667
Squid I
2
589
325.4667
Squid II
3
592
326.3333
Thorn
0
592
327.0167
Spider I
1
593
327.6167
Squid I
2
595
328.0500
Thorn
0
595
328.2500
Spider I
1
596
329.0833
Squid I
2
598
329.0833
Squid II
3
601
329.9167
Thorn
0
601
330.5833
Spider I
1
602
331.1667
Squid I
2
604
331.5833
Thorn
0
604
331.8000
Spider I
1
605
332.6167
Squid I
2
607
332.6167
Squid II
3
610
333.4167
Thorn
0
610
334.0667
Spider I
1
611
334.6333
Squid I
2
613
335.0333
Thorn
0
613
335.2333
Spider I
1
614
336.0333
Squid I
2
616
336.0333
Squid II
3
619
336.8167
Thorn
0
619
337.4333
Spider I
1
620
337.9833
Squid I
2
622
338.3833
Thorn
0
622
338.5667
Spider I
1
623
339.3333
Squid I
2
625
339.3333
Squid II
3
628
340.1000
Thorn
0
628
340.7000
Spider I
1
629
341.2333
Squid I
2
631
341.6167
Thorn
0
631
341.8000
Spider I
1
632
Goes on eternally...