So I don't know of any specifics related to Coop (as compared to PvP), but I do know that Riot recently changed their formula. If I understand the new formula correctly, there should be no difference between PvP and PvE IP/XP gains on a per game basis (obvious caps still apply).
Previously, the system was based around providing IP in comparison to the 20minute mark (also known as the surrender minimum time). As you played towards that mark you gained more IP/XP and after that mark, these gains rapidly diminished.
To help explain this, let's take the following sample:
I play a PvP against Grace Note and she beats me 25 minutes in. She gets about 115 IP (plus a bonus) for winning and I get about 65 for losing. Now, let's say we play again and again she wins, but this time it takes her 45 minutes to woop my butt. I would get 72 IP for hanging in longer, but she would only get 100IP!
Obviously the goal here was to penalize longer wins and shorter losses. Unfortunately, this encourages farming games, where teams agree to surrender at the 20 minute mark. So Riot changed that formula to a new one. Here's your TL;DR:
IP/XP scales with time
For those concerned about endless games, the formula is essentially linear up till the 55 minute mark. Additionally, both Winners and Losers scale up with time (meaning you're no longer penalized for a long win). There is also an extra flat bonus for playing the game which does not scale. Finally, they've also removed the bonus for non-leaver streaks (in preference to the new judgement system.
For more information on the new system you can read here.
Also, pictures!
Post Script
For those unaware there are also difficulty scaling modifiers for Coop vs AI
These percentages represent how much of the standard reward is received:
- Summoner level 1-9: Beginner: 100% Intermediate: 100%
- Summoner level 11-19: Beginner: 75% Intermediate: 100%
- Summoner level 20-29: Beginner: 50% Intermediate: 100%
- Summoner level 30: Beginner: 25% Intermediate: 75%
General
- Custom games are only worth 75% of the IP you would have earned in a normal game.
- Co-op vs. AI games incur penalties based on summoner level and difficulty:
- Level 10-19: Beginner games are worth 85%.
- Level 20-29
- Beginner games are worth 70%.
- Intermediate games are worth 90%.
- Level 30
- Beginner games are worth 55%.
- Intermediate games are worth 80%.
Win
- 2.305 IP per minute up until 55 minutes.
- 18 IP bonus for completing a match (~7.8 minutes worth of IP)
Loss
- 1.402 IP per minute up until 55 minutes.
- 16 IP bonus for completing a match (~11.4 minutes worth of IP)
Graph
Optimum Game Length
Riot Games has designed their IP system to reward playing the game to completion and to reward longer games:
Q: Will I be getting more or less IP and XP as a result of this change?
A: While you will get more or less in some games, the average XP/IP gain will be much more consistent. If you typically played very long games, you will tend to get more IP and XP; however, if you typically play short games, you will get slightly less IP and XP.
While you do get a bonus beyond the "per minute IP", that bonus is designed to compensate players for the time between matches:
Q: It seems unfair that I spend 5 minutes milling around in queue and in champion select, and don't get an IP/XP reward for that. Does this system help with this at all?
A: Actually, it does! All game types give a slight 'completion bonus' that is equivalent to several minutes of play. This is embedded in IP you earn.
That being said: provided you could get into another game in substantially less that 7.8 minutes, you'd make out slightly better by surrendering and starting a new game. You'd have to do this a lot to see a substantial gain, however. If it took you longer to get into the next game, you'd actually incur a loss overall.
In short, it'll usually be best to play to 55 minutes, then bail out if you're very likely to lose. At that point, you're essentially playing to see if you'll get 145 IP vs 94 IP. If losing seems like a foregone conclusion, then you're mostly playing for the experience at that point.
Sources
- Items in the general section: League of Legends @ Wikia
- Win/Loss Accrual Rates: Based on recorded values after the completion of games. There are some instances where (rate * minutes) does not exactly equal what I recorded from the game client when you round up, but overall the above rates serve as a good enough rule of thumb for my purposes.
- IP System FAQs
Reference
Best Answer
The wall was made thick enough so that you couldn't just flash or 'jump' over/through the wall and quickly end the game (Master Yi, Jax, Trynd, etc. ), so I wouldn't be surprised if very few ,if any champs at all, could make it over the wall.
I've heard that Kha'zix evolved leap can make it over as well as Elise as long as an enemy is on the other side. I've also heard that if you're lucky Shaco's Decieve can make it over the wall as well with practice. Jarvan's may be possible but haven't seen someone post about trying it.