uck-00f00m: Duplo to Duplo (*Note 1)
uck-00f01m: Duplo to Fischertechnik.
uck-00f02m: Duplo to Gears! Gears! Gears! (*Note 2)
uck-00f03m: Duplo to K'Nex.
uck-00f04m: Duplo to Krinkles.
uck-00f05m: Duplo to Lego (*Note 3)
uck-00f06m: Duplo to Lincoln Logs.
uck-00f07m: Duplo to Tinkertoys.
uck-00f08m: Duplo to ZomeTool. (*Note 4)
uck-00f09m: Duplo to Zoob. (*Note 5)
uck-01f00m: Fischertechnik to Duplo.
uck-01f01m: Fischertechnik to Fischertechnik (*Note 1)
uck-01f02m: Fischertechnik to Gears! Gears! Gears! (*Note 2)
uck-01f03m: Fischertechnik to K'Nex.
uck-01f04m: Fischertechnik to Krinkles.
uck-01f05m: Fischertechnik to Lego.
uck-01f06m: Fischertechnik to Lincoln Logs.
uck-01f07m: Fischertechnik to Tinkertoys.
uck-01f08m: Fischertechnik to ZomeTool. (*Note 4)
uck-01f09m: Fischertechnik to Zoob. (*Note 5)
uck-02f00m: Gears! Gears! Gears! to Duplo.
uck-02f01m: Gears! Gears! Gears! to Fischertechnik.
uck-02f02m: Gears! Gears! Gears! to Gears! Gears! Gears! (*Note 1)
uck-02f03m: Gears! Gears! Gears! to K'Nex.
uck-02f04m: Gears! Gears! Gears! to Krinkles.
uck-02f05m: Gears! Gears! Gears! to Lego.
uck-02f06m: Gears! Gears! Gears! to Lincoln Logs.
uck-02f07m: Gears! Gears! Gears! to Tinkertoys.
uck-02f08m: Gears! Gears! Gears! to ZomeTool. (*Note 4)
uck-02f09m: Gears! Gears! Gears! to Zoob. (*Note 5)
uck-03f00m: K'Nex to Duplo.
uck-03f01m: K'Nex to Fischertechnik.
uck-03f02m: K'Nex to Gears! Gears! Gears! (*Note 2)
uck-03f03m: K'Nex to K'Nex (*Note 1)
uck-03f04m: K'Nex to Krinkles.
uck-03f05m: K'Nex to Lego.
uck-03f06m: K'Nex to Lincoln Logs.
uck-03f07m: K'Nex to Tinkertoys.
uck-03f08m: K'Nex to ZomeTool. (*Note 4)
uck-03f09m: K'Nex to Zoob. (*Note 5)
uck-04f00m: Krinkles to Duplo.
uck-04f01m: Krinkles to Fischertechnik.
uck-04f02m: Krinkles to Gears! Gears! Gears! (*Note 2)
uck-04f03m: Krinkles to K’Nex.
uck-04f04m: Krinkles to Krinkles (*Note 1)
uck-04f05m: Krinkles to Lego.
uck-04f06m: Krinkles to Lincoln Logs. (*Note 6)
uck-04f07m: Krinkles to Tinkertoys.
uck-04f08m: Krinkles to ZomeTool. (*Note 4)
uck-04f09m: Krinkles to Zoob. (*Note 5)
uck-05f00m: Lego to Duplo (*Note 3)
uck-05f01m: Lego to Fischertechnik.
uck-05f02m: Lego to Gears! Gears! Gears! (*Note 2)
uck-05f03m: Lego to K'Nex.
uck-05f04m: Lego to Krinkles.
uck-05f05m: Lego to Lego (*Note 1)
uck-05f06m: Lego to Lincoln Logs.
uck-05f07m: Lego to Tinkertoys.
uck-05f08m: Lego to ZomeTool. (*Note 4)
uck-05f09m: Lego to Zoob. (*Note 5)
uck-06f00m: Lincoln Logs to Duplo.
uck-06f01m: Lincoln Logs to Fischertechnik.
uck-06f02m: Lincoln Logs to Gears! Gears! Gears! (*Note 2)
uck-06f03m: Lincoln Logs to K’Nex.
uck-06f04m: Lincoln Logs to Krinkles.
uck-06f05m: Lincoln Logs to Lego.
uck-06f06m: Lincoln Logs to Lincoln Logs (*Note 1)
uck-06f07m: Lincoln Logs to Tinkertoys.
uck-06f08m: Lincoln Logs to ZomeTool. (*Note 4)
uck-06f09m: Lincoln Logs to Zoob. (*Note 5)
uck-07f00m: Tinkertoys to Duplo.
uck-07f01m: Tinkertoys to Fischertechnik.
uck-07f02m: Tinkertoys to Gears! Gears! Gears! (*Note 2)
uck-07f03m: Tinkertoys to K'Nex.
uck-07f04m: Tinkertoys to Krinkles.
uck-07f05m: Tinkertoys to Lego.
uck-07f06m: Tinkertoys to Lincoln Logs.
uck-07f07m: Tinkertoys to Tinkertoys (*Note 1)
uck-07f08m: Tinkertoys to ZomeTool. (*Note 4)
uck-07f09m: Tinkertoys to Zoob. (*Note 5)
Note 1. It is unnecessary to provide "self-reflexive" adapters (for e.g. Duplo-to-Duplo, Lego-to-Lego) as these are inherently available from the supported manufacturers.
Note 2. Owing to the genderless nature of "Gears! Gears! Gears!", there is no need for bi-directional adaptation. Models adapting to this playset can be found in the section numbered uck-02xxxx.
Note 3. It is unnecessary to provide Duplo-to-Lego adaptors, as these playset are made by the same manufacturer and already adapt to each other. All Duplo dimensions are exactly 2x that of Lego.
Note 4. The ZomeTool playset is actively protected by US Patent No. 6840699 (filed 1 November 2002, by Steven F. Rogers and Paul R. Hildebrandt). Models adapting to ZomeTool will be made available in November 2022; check http://fffff.at for details.
Note 5. The Zoob playset is actively protected by US Patent No. 5897417 (filed 11 December 1996, by Michael J. Grey). Models adapting to the Zoob playset will be made available in December 2016; check http://fffff.at for details.
Note 6. The genderless nature of Krinkles and Lincoln Logs makes adapter uck-04f06m redundant. Use piece uck-06f04m to make this connection.