Link Joker 

the 3 main circles that LJ will lock---the 2 front row rear circles and the rear cirlces behind the vanguard (forming an inverted triangle formation from the player perspective)

LOCK-for easier understanding  whatever u do , for a turn . the unit in that circle that is locked WILL STAY THERE no matter what u do . and u cannot activate his ability . simple . whatever thing u attempt it WILL STAY THERE , eg retiring,intercepting all wont work.

if u still dont understand just put a piece of paper on the locked circle and leave it there for the turn

Major playstyle-locking opponent units 

Link joker is not the only clan with locking abilities, most reversed units have locking abilities , however link joker is the only clan which lock opponents units. they will lock the 3 main circles as it weakens the opponent the most 

Pros

-can screw up ur opponents strategy and playstyle

-fairly cheap costs

-locked units cannot be unlocked (as of current)

Cons

-counterblast nessecary for most abillities

-as of current locking is basically all it can do XD

How to play - autopilot deck

How to counter

linkjoker cannot lock circles with no units on them . so take advantage of that

-Rushing with a full field is still possible against Link Joker . however u must get rid of the units before u end the turn . for example, spikebrother , sdd , pbd , murakumo , bermuda

Spikebrother- as they run back to the turn at the end of the turn . clear the 3 main circles and u can continue ur assault as per normal next turn

SDD/PBD-they will eat their units , so just eat the 3 main circles and ur opponent cant screw u much 

Murakumo- cloning , nth for them to lock

Bermuda- bouncing , such as pearle sisters . so as to clear the circles

-Use decks that are more dependant on soul , and not units that dependant on rear units , for example Alfred (both royal and gold) , or clans that are dependant on formation , eg , Aqf  . Best builts to use against link joker ? decks like Xrides , Perfect Raiser , DLOTA/Amon all works . Amon is prefered over DLOTA as he can "EAT" his rears