Hell's Park Underside

Before challenging a stage, its difficulty level can be selected. Higher difficulties will increase enemy levels, add skills to the enemy, and add team-building restrictions.

When a stage is cleared, the player receives the reward for that level, as well as the rewards for all levels below it. These rewards reset monthly.

Initially, only 10 difficulty levels are available for each stage. Clearing level 10 on a stage unlocks levels 11-20 for that stage, clearing level 20 unlocks levels 21-30, and so on.

Level	Gold	Silver
1	??	??
2	??	??
3	??	??
4	??	??
5	??	??
6	??	??
7	??	??
8	??	??
9	5	300
10	5	300
11	-	100
12	-	100
13	-	100
14	-	100
15	-	100
16	-	100
17	-	100
18	-	100
19	-	100
20	-	100
21	-	30
22	-	30
23	-	30
24	-	30
25	-	30
26	-	30
27	-	30
28	-	30
29	-	30
30	-	30

Notes

• Gold badges seem to only come from the first 10 levels of each area. After that, you just get silver badges.

Friendship Badge shop

Gold badges

Exchange Lineup	Gold badge cost	Cap
Lost Name	600	1
Lost Name Spirit × 10 (1st set)	100	10
Lost Name Spirit × 10 (2nd set)	150	20
Lost Name Spirit × 10 (3rd set)	200	30
Transcend Stone for Lost Name × 1 (1st set)	100	94
Transcend Stone for Lost Name × 1 (2nd set)	200	88

Notes:

• Gold badge rewards do not reset monthly.
• Initially only Lost Name is available, but after buying him, the spirit and transcend options are unlocked.
• Each set of spirits is unlocked after the previous set is exhausted. The same concept applies to the transcend stones.

Silver badges

Exchange Lineup	Gold badge cost	Cap
Hell Genome Cube × 1	1,000	No Cap
Pixie Underside Genome	3,000	1
Sword of Kusanagi 5★	100	20 / Month
Yata Mirror 5★	500	5 / Month
Yasaka Magatama 5★	200	5 / Month
Kasane Magatama	3,000	2 / Month
Aether Crystal	1,000	1 / Month
Skip Ticket (Sin) x20	3,000	1 / Month
Essence of Sin x160	2,000	2 / Month
Mitama Extract St x10	300	5 / Month
Mitama Extract Ma x10	300	5 / Month
Mitama Extract Vi x10	300	5 / Month
Mitama Extract Ag x10	300	5 / Month
Mitama Extract Lu x10	300	5 / Month
Blank Genome	1,500	2 / Month
6★ Brand Cube	500	10 / Month

The Hell Genome Cube gives a random skill genome from a very large pool. A few of the skills are rare and exclusive:

Genome	Notes
Fortunate park visitor	Rare, exclusive
Trisagion Underside	Rare, exclusive
Ice Age Underside	Rare, exclusive
Struggle Slash Underside	Rare, exclusive
Fire Slash Underside	Rare, exclusive
Ice Slash Underside	Rare, exclusive

Misc

A Red Illuyanka was given out on Jan 20, 2025 with the exclusive skill Illuyanka Underside.