#4128
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✦ Chase Index #4128·Set rank #60
Rocket's Secret Experiment
Uncommon
GYM CHALLENGE·#120·OCT 2000·TRAINER
Uncommon
Current market price
$9.66
+106.4%
7d
+107.7%
30d
+93.2%
All time
1ST EDITION · TCGPLAYER · 2026-06-16
01 · All-time high
$9.66
43 snapshots
02 · All-time low
$4.65
since 2026-05-05
03 · Set rank
#60
of 132 in G2
04 · Tracking since
2026-05-05
43 price snapshots
01 · Price history
43 snapshots
Full price history.
Daily market-price snapshots — every data point is a dated price reading, never an estimate.
Total return
+93.2%
Price range
$4.65 → $9.66
Snapshots
43
Tracking since
2026-05-05
Gym Challenge, tracked.
Rocket's Secret Experiment is a Uncommon from Gym Challenge. Released OCT 2000.
Currently ranked #4128 on the Chase Index - our composite score across price, weekly price movement, 30-day community chases, and page views.
Since first tracked, the price has appreciated 93.2% in total.
Card number
#120
Released
OCT 2000
Rarity
Uncommon
Supertype
Trainer
Series
Gym
Market source
Market price · Updated daily
03 · Variants
2 variants
Different variants, different prices.
Holofoil, reverse, 1st edition — each variant trades at its own price band. The current market column is what feeds the index.
| Variant | Low | Mid | Market | High |
|---|---|---|---|---|
| Unlimited | $2.95 | $4.41 | $4.46 | $48.06 |
| 1st Editioncurrent | $4.33 | $5.51 | $9.66 | $53.70 |
04 · Related cards
From the same set
More from Gym Challenge.
Top chases from the same expansion — ranked by Chase Index score.
06 · Reference desk
Rocket's Secret Experiment, explained.
Everything about this card — the price, the variants, and how we track it.
3 questions answered
Q.01
Is Rocket's Secret Experiment from Gym Challenge a good investment?
We track prices, not provide investment advice. The Chase Index rank and price history above show how collector demand has moved since we started tracking this card.
Q.02
How is the market price determined?
We pull daily snapshots of the market price - the median of recent Near Mint sales. The current figure reflects the 1st Edition variant.
Q.03
What does the Chase Index rank mean?
The Chase Index ranks cards on a composite score: 15% market price percentile, 35% upward-only 7-day price move, 30% rolling 30-day community chases, 20% recent page views. The global index is restricted to cards priced ≥ $5 and, for now, excludes vintage cards (pre-2004 sets), reverse holofoils, and Commons; per-set and per-tag rankings include every card. A card near the top leads on multiple dimensions.