Level 69

Many players feel a sigh of relieve when they get past level 69 and land on level 70. Some feelts it is psychological, but it is really the hardest level. At level 69, you need 1.2 mil exp to level up. That is more than the 1.198 mil exp needed to level up at level 79 to the max level of 80.
You can see it in the table below.

When you get past 69 to 70, it is also close enough to call it the halfway mark to the max level of 80. So if you feel that your hero is stuck at level 69, be patience, it is indeed the hardest level of all.

Level	Exp to level up	Total exp attained	Percentage of exp to level 80
1	186	0	0.00%
2	386	186	0.00%
3	602	572	0.00%
4	835	1174	0.01%
5	1087	2009	0.01%
6	1361	3096	0.01%
7	1659	4457	0.02%
8	1984	6116	0.03%
9	2339	8100	0.04%
10	2727	10439	0.05%
11	3151	13166	0.06%
12	3617	16317	0.08%
13	4128	19934	0.09%
14	4689	24062	0.11%
15	5306	28751	0.13%
16	5985	34057	0.16%
17	6732	40042	0.19%
18	7554	46774	0.22%
19	8459	54328	0.25%
20	9457	62787	0.29%
21	10556	72244	0.33%
22	11768	82800	0.38%
23	13103	94568	0.44%
24	14575	107671	0.50%
25	16196	122246	0.57%
26	17984	138442	0.64%
27	19954	156426	0.72%
28	22124	176380	0.82%
29	24516	198504	0.92%
30	27150	223020	1.03%
31	30051	250170	1.16%
32	33246	280221	1.30%
33	36764	313467	1.45%
34	40637	350231	1.62%
35	44898	390868	1.81%
36	49588	435766	2.02%
37	54747	485354	2.25%
38	60420	540101	2.50%
39	66659	600521	2.78%
40	73518	667180	3.09%
41	81056	740698	3.43%
42	89340	821754	3.80%
43	98441	911094	4.22%
44	108437	1009535	4.67%
45	119413	1117972	5.17%
46	131464	1237385	5.73%
47	144692	1368849	6.33%
48	159208	1513541	7.00%
49	175135	1672749	7.74%
50	192606	1847884	8.55%
51	211767	2040490	9.44%
52	232777	2252257	10.42%
53	255809	2485034	11.50%
54	281055	2740843	12.68%
55	308720	3021898	13.99%
56	339032	3330618	15.41%
57	372237	3669650	16.98%
58	408605	4041887	18.71%
59	448430	4450492	20.60%
60	450000	4898922	22.67%
61	465125	5348922	24.75%
62	480500	5814047	26.91%
63	496125	6294547	29.13%
64	512000	6790672	31.43%
65	528125	7302672	33.80%
66	544500	7830797	36.24%
67	561125	8375297	38.76%
68	578000	8936422	41.36%
69	1200000	9514422	44.03%
70	984000	10714422	49.59%
71	1006560	11698422	54.14%
72	1029440	12704982	58.80%
73	1052640	13734422	63.56%
74	1076160	14787062	68.43%
75	1100000	15863222	73.41%
76	1124160	16963222	78.50%
77	1148640	18087382	83.71%
78	1173440	19236022	89.02%
79	1198560	20409462	94.45%
80	1224000 (locked)	21608022	100.00%