There are 222 parliamentary seats up for grabs, with the ruling BN currently holds 135 seats, Pakatan Rakyat, 75, and the other 12 going to independents and three other parties. Whichever coalition that wins 112 seats will claim power.
Meanwhile, Pakatan controls four states - Selangor, Penang, Kelantan and Kedah, while BN has nine under its belt.
This election will see a huge number of new voters - an increase of three million, or 25 percent, since the 2008 GE, making it the biggest spike in Malaysia’s history.
Malaysiakini provides the following analyses on the seats, the states and the issues that matter in this mother of all battles.
ANALYSIS
Ordinary Malaysians, extraordinary day
Will the economy collapse if Pakatan wins GE13?
Inside the 505 generation - the youth vote
Najib's 'transformation' magic found wanting
Shadows of the past stalk GE13 campaign
BN's femme fatale - the power of women
People or party? Wooing civil servants
Buying support - Najib's 'commercialisation' of GE13
GE13 post-nomination revelations
Crossing the lines - BN's early strategic mistakes
Najib's dilemma over selection of candidates
Chance for change? The possibility is there
PKR in many minds over Anwar's Perak foray
Rainforest graft a major focal point in GE13
Whither the Indian middle-ground politics?
Spectre of bias hovers over Malaysian vote
Will Pakatan suffer the Icarus complex?
Roadshow versus road rage in GE13
KEDAH
Padang Serai voters wary of 'frogs'
Mukhriz as MB can sway fence-sitters, survey finds
On paper, Pakatan should retain Kedah
PAS' confidence in Kedah may be its undoing
PENANG
Three key Malay-majority seats in Penang finely poised
Uncertainties in Machang Bubok's six-corner battle
Protests mount in Penang by disgruntled BN hopefuls
Three Penang BN leaders declare war on coalition
Gerakan and MCA hope to avoid getting an 'egg'
In Penang, election time is also party time
'Truly transformational team' for Umno in Penang
Changes in Penang top leadership post-GE?
Will Balik Pulau vote for an outsider as MP?
Battle in Malay, mixed areas - four seats to watch
As its term ends, can Penang remain in Pakatan hands?
PERAK
PKR in bid to checkmate Tambun's 'grand master'
Gains for both sides after first half of campaign
Samy 'magic' may not work in Sungai Siput
Malay vote vital for Perak Pakatan two-thirds majority
Ngeh and Kula's camp go at it again
Samy still the muscle in Sungai Siput?
Does Pakatan still want Nizar as MB?
Nizar may move to Changkat Jering state seat
PAHANG
Bentong now within striking distance for DAP
Will Lynas plant be a major election issue?
SELANGOR
PAS looks for Malay support in Shah Alam
Selangor Malay belt a hive of activity
'Video stars and the corrupt become BN candidates'
Zul Noordin peddles 1M'sia sireh to Indians
To win, candidates must solve Kota Raja conundrum
Glomac CEO in crowded Selangor BN menteri besar list
FEDERAL TERRITORIES
Will Pakatan retain 10 out of 11 seats in KL?
Murder takes centre stage in PAS Putrajaya campaign
Pakatan needs 7pct vote swing to win Putrajaya
NEGRI SEMBILAN
Race for N Sembilan heats up as house dissolves
MALACCA
Will Ali Rustam remain as Malacca CM?
JOHOR
PKR underdog threatens to unseat Umno Youth No 2
Pakatan leads in almost half of Johor targeted seats
Pakatan chips away at BN's last bastion of dominance
BN parrots 'Ubah' in Pakatan's only Johor foothold
Despite Chinese storm, Puad set to retain Batu Pahat
Multi-ethnic face for Pakatan's Kluang campaign
In battle for Labis, MCA legacy on Chua Jr's shoulders
'Malay nationalism' a hurdle for Johor Pakatan
Minister, ex-minister in tough battle for Segamat
Kit Siang walks the tightrope between ethnic groups
DAP seeks to reinforce presence in Johor
Ghani counterstrike could 'paralyse' Kit Siang
Gen Hashim adds four-star glitter to PKR cast
Multi-ethnic front, votes key to Pakatan hopes in Johor
Tan Sri vs Tan Sri battle building up in JB
SABAH
Sabah Pakatan's four in the bag won't meet federal target
Pakatan inroads likely in BN's last bastion
Bajau votes stumbling block for Bumburing
Will PKR's gamble on Lajim pay off?
Revolt may threaten Pakatan's Sabah hopes
Opposition in Sabah a perfect storm or storm in a teacup?
Only Sabahans should form state gov't, says SAPP
Najib and Anwar turn up the heat in Saratok
DAP's slow momentum picking-up in Sibu
All-out fight for Sibu on the cards
Sarawak the battleground in contest for Putrajaya
Sarawak Pakatan aims to bag a dozen seats
Baram dam dampens Sarawak BN's spirits
Internal split is Sarawak BN's weakest link
Watch this page. More to follow.
