I started ending the last two levels, when it had only one slot to go, by destroying only small machines on Archipelago. Ticks, Seekers and Runners, and Hunters in the beginning. Nearing the end, I started destroying one machine at the time, run away, hid, and waited until the score bar showed. Repeated this until the next level was reached and gave me 5 uranium. Then I wrote down the total XP reached so far.
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Level 87 ended with 4468910 XP (With a max possible overflow of one Prototype Runner’s XP)
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So Level 88 started with 4468910 XP
Level 88 ended with 4538906 XP > Difference gives total XP 69996 / 21 = ~3333 XP per slot
I had some overflow issues with level 89, when more enemies were killed in an unexpected cars explosion. I couldn’t get a reliable XP reading for that level, that’s why I combined the levels 89 and 90, see below.
- So Level 89 started with 4538906 XP
Level 89 and 90 together ended with 4678899 XP > Difference gives total XP 139993 / 42 (2x21) = ~3333 XP per slot.
I did a single slot reading by noting each kill for the last slot killing low XP Machines, which was 3304 XP. So with an overflow into the previous slot, the slot value could easily be 3333.
Level 91 started with 4678899 XP
Level 91 ended with 4748943 XP > Difference gives total XP 70044 / 21 = ~3335 XP per slot.
Level 92 started with 4748943 XP
Level 92 ended with 4818890 XP > Difference gives total XP 69947 / 21 = ~3330 XP per slot.
Level 93 started with 4818890 XP
Level 93 ended with 4888897 XP > Difference gives total XP 70080 / 21 = ~3337 XP per slot.
Level 94 started with 4888897 XP
Level 94 ended with 4958895 XP > Difference gives total XP 69925 / 21 = ~3329 XP per slot.
Once again I had an too big overflow when ending level 95, so I had to combine 95 and 96.
Level 95 started with 4958895 XP
Level 96 ended with 5098876 XP > Difference gives total XP 139981 / 42 (2x21) = ~3332.8 XP per slot.
Level 97 started with 5098876 XP
Level 97 ended with 5169032 XP > Difference gives total XP 70156 / 21 = ~3340 XP per slot.
Level 98 started with 5169032 XP
Level 98 ended with 5238984 XP > Difference gives total XP 69952 / 21 = ~3331 XP per slot.
Level 99 started with 5238984 XP
Level 99 ended with 5308876 XP > Difference gives total XP 69892 / 21 = ~3328 XP per slot.
Level 100 started with 5308876 XP
Level 99 ended with 5379078 XP > Difference gives total XP 70202 / 21 = ~3342 XP per slot.
Taken overflow in account all measured levels so far seems to be holding 3,333.333 XP per progression slot.