Rocket's Secret Experiment

Challenge from the Darkness · #promo · Uncommon · 1998JPN

$5.08
Market price ▲ 3.0% (30d)
Prices as of Aug 14, 2026
144graded pop
23%gem rate
30.7×PSA 10 vs raw
0%off ATH $2.42 · Aug 2026
+$21.09EV to grade — marginal
Market data

Price history

Normal▼ 0.6% 7d
Low $1.20Mid $4.95High $10.00

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Graded market

Graded values

PSA 10 report →updated 2026-08-13
Grade 6 est.$2.30
Grade 5 est.$1.94
Grade 4 est.$1.60
Grade 3 est.$1.33
Grade 2 est.$1.09
Grade 1 est.$0.92

Grades 1–6 are estimates modeled from the raw price — PSA/CGC/BGS 7–10 and Ungraded are live tracked market values.

PSA 10 price history$156.00

PSA 10 chart is building — graded values are tracked nightly, a new point appears each day.

Graded population census · updated 2026-08-01

CGC80 graded · 20 gem 10
PSA64 graded · 13 gem 10

Population data from PriceCharting, updated monthly.

How much is Rocket's Secret Experiment #promo worth?

A raw copy of Rocket's Secret Experiment #promo (Challenge from the Darkness, 1998) is worth about $5.08 right now, based on the latest market data from August 14, 2026.

Grading changes the math on this one: a PSA 10 is valued around $156.00, roughly 30.7x the raw price, while a PSA 9 sits near $20.00. 80 copies have been graded to date, and 25% of them came back a 10 — worth knowing before you pay grading fees.

These figures come from nightly market-data syncs verified against completed sales. Use the chart above to see the trend before you buy or sell.

Collecting Challenge from the Darkness?Full master set guide — every card, chase list, and completion cost→

Other printings of Rocket's Secret Experiment 1

Rocket's Secret Experiment #120 Gym Challenge
Rocket's Secret Experiment
Gym Challenge · #120/132