The Steel Ball Paradox Part.2 - How can this be a Very Difficult Puzzle?

My Amazon.com shop:
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The Puzzles shown in this video are available here:
Alles Roger: https://www.puzzlemaster.ca/browse/metalpuzzles/premiummetal/15494-alles-roger?a=643812
R2D2: https://www.puzzlemaster.ca/browse/metalpuzzles/premiummetal/15495-r2d2?a=643812
Water Tap: https://www.puzzlemaster.ca/browse/metalpuzzles/premiummetal/15496-wasserhahn-water-tap-?a=643812
Lock and Key: https://www.puzzlemaster.ca/browse/metalpuzzles/premiummetal/15497-schl-ssel?a=643812
Complete Set: https://www.puzzlemaster.ca/browse/metalpuzzles/premiummetal/15498-group-special-set-of-4-roger-d-metal-puzzles?a=643812

Oloid (Marble): https://jpgamesltd.co.uk/Marble-Oloid-Geometric-DeskToy?tracking=5b69d72b2ffff
Oloid (Wood): https://jpgamesltd.co.uk/Wood-Oloid-Fidget-Toy?tracking=5b69d72b2ffff
Kuboid: https://jpgamesltd.co.uk/Hexyflex-Wire-Cube?tracking=5b69d72b2ffff
Details about the Oloid: https://en.wikipedia.org/wiki/Oloid
R2D2 Puzzle: N/A

Music and SFX I used in this video is available here:
https://bit.ly/375iM19

More cool puzzle shops I do recommend:

US:
https://www.puzzlemaster.ca/?a=643812
https://www.creativecrafthouse.com/?Affiliate=MrPuzzle
https://www.artofplay.com/?rfsn=608338.8fb543
https://www.shareasale.com/r.cfm?b=1490312&u=1695622&m=94752 (10% discount by using the voucher "Mr Puzzle")

Europe:
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https://cruxpuzzles.co.uk/ref/christianihlo/?campaign=Mainpaige
https://www.knobelbox.com/?sPartner=mrpuzzle
https://www.logicagiochi.com/?cmid=YkVpQVBsSnVhT1k9&afid=Z0dTMUZ0UGZ2eFk9&ats=RGNxMWsyM2ExMlU9

Asia & Australia:
https://www.siammandalay.com/?ac=mrpuzzle
https://cmycubes.com/?ref=1himb1lcs_k- (5% off by using Coupon Code "MRPUZZLE")

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Видео The Steel Ball Paradox Part.2 - How can this be a Very Difficult Puzzle? канала Mr.Puzzle