Recommended Build

Playing as Jayce

Tips to maximize your impact

Poke through your gate
In cannon form, fire Shock Blast (Q) through Acceleration Gate (E) from the start of lane: the orb gains speed, range and damage, and it's your best poke.
All-in with the hammer
To all-in, switch to hammer: leap in with To the Skies! (Q), activate Lightning Field (W), then knock your target back with Thundering Blow (E).
Auto after every swap
Land an auto after each weapon swap: switching to Mercury Cannon (R) reduces your target's armor and magic resist, and your first hammer hit deals bonus magic damage.
Swap weapons to escape
To escape, swap weapons then walk through Acceleration Gate (E): Hextech Capacitor (passive) and the gate each give you move speed.

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Global strengths and weaknesses

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Build, runes and tips against each opponent

How to counter and exploit weaknesses

Watch for the orb behind his gate
When he places Acceleration Gate (E), expect Shock Blast (Q) through it: the orb gains speed, range and damage.
Back off when he goes hammer
If you have range, back off when he switches to hammer: Mercury Hammer (R) makes him tankier, and he can't go back to cannon for 6 seconds.
Engage after his Thundering Blow
Engage after Thundering Blow (E): it's his only knockback, and it has a 20 to 10 second cooldown.
Drag the game out
If you survive the laning phase, play for time: Jayce is strongest early, when his cannon range dominates the lane.