Knockout Kings
55
FunAverage
R4
RarityUncommon
Market Value
Loose$9
Complete$19
New$38
Based on recent market activityUpdated Sep 5, 2026
Market Value
Loose$9
Complete$19
New$38
Based on recent market activityUpdated Sep 5, 2026
Knockout Kings
RARITY
R4
Uncommon
Top 87% of Game Boy Color
FUNFUN FACTOR
55
Average
Top 45% of Game Boy Color
MARKET VALUEUpdated Sep 5, 2026
Apr 20
May 4
May 18
Jun 1
Jun 15
Jun 28
Jul 12
Jul 26
Aug 9
Aug 23
Today
Loose value historyBased on recent market activity
Listings
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Value History
$20
$16
$11
$7
Apr 20
May 4
May 18
Jun 1
Jun 15
Jun 28
Jul 12
Jul 26
Aug 9
Aug 23
Today
Rarity Insight
R4 on the rarity scale (R1 - R10)
We see these listed regularly, though not everywhere you look.
Platform Rarity DistributionHow rarity works
Nerdy Rank
Ownership Breakdown
0Total Copies
Owned
Owned
ConditionCopiesPercent
Loose
00.0%Complete (CIB)
00.0%New / Sealed
00.0%Graded
00.0%Based on 0 collectors with this game in their collectionView My Collection
Graded Report
01
1607080859095100
1graded copy seen
Item Details
Knockout Kings is a sports game for the Game Boy Color, released in 1999. A loose copy sells for around $9, complete in box $19, and sealed $38. We rate it R4 (Uncommon), findable on GB Color with a little looking, with a Fun Factor of 55.
